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CA CDL
DMV Commerical Driver Licence
| Question | Answer |
|---|---|
| idling primary diesel engine | limited to five minutes |
| running auxiliary diesel engine | limited to five minutes if within 100 feet of restricted areas |
| within 100 feet of a school | turn off engine upon arrival |
| idling public transit bus | no more than 10 minutes prior to/during passenger boarding |
| single vehicle length | 40 feet |
| front bumper may extend | 2 feet ahead of fenders |
| bus safety bumper may extend | 3 feet |
| wheelchair lift may extend | 18 inches |
| bus bike racks may extend additional | 36 inches in front |
| articulated bus or trolley length | 60 feet |
| tractor trailer length | 65 feet |
| tractor trailer and semitrailer combo | 75 feet (neither trailer can exceed 28 1/2 feet) |
| load length | 75 feet |
| load length for poles | timbers |
| load cannot extend | more than 3 feet in front |
| vehicle or load width | 102 inches (8 1/2 feet) or 108 inches including air filled tires |
| handles on sides | 3 inches or 6 inches for RVs |
| lights | mirrors |
| special construction equipment width | 120 inches (10 feet) |
| buses for hire in cities/suburbs width | 104 inches |
| loose agricultural product load width | 120 inches |
| maximum width with special Caltrans permit | 12 feet for trusses or similar one-piece construction components |
| height limit | 14 feet |
| gross weight carried by any one axle | 20 |
| gross weight placed on highway by wheels of one axle | 18 |
| gross weight placed on highway by front or steering axle wheels | 12 |
| gross weight on two consecutive sets of tandem axles | 68 |
| CHP uniform weight standards | technically won't allow you to proceed if you exceed limits by 100 pounds |
| 55 mph limit for | any truck or tractor with 3 or more axles; any vehicle pulling another vehicle; school bus with pupils; carrying farmworkers; explosives on board; trailer bus |
| right lane rule | must drive in right-hand lane or as close as possible to right curb; second to right lane on a 4 lane divided highway |
| slow vehicle rule | must pull over at nearest turnout if there are 5 or more vehicles waiting behind you |
| driver's record of duty status | record all of the driver's hours in duplicate to present for inspection -- to make sure driver isn't violating hours of service limits |
| report these accidents to DMV and CHP | if it results in death |
| hours of service: driving | 11 hours federal |
| hours of service: on duty | take a break from driving after 14 hours on duty |
| hours of service: multiple days | 60 hours in 7 days |
| hours of service: off duty time | need 10 consecutive hours off for daily limits |
| as you approach your vehicle | check: leaning to one side; oil |
| pre-trip 1 | as you approach vehicle |
| pre-trip 2 | check that parking breaks are set and/or wheels chocked |
| pre-trip 3 | engine compartment: leaks/hoses; check oil; coolant level; power steering fluid; windshield washer fluid; automatic transmission fluid; belts |
| pre-trip 4 | cab check/engine start: hood is closed and latched; depress clutch; put in neutral or park; start engine |
| pre-trip 5 | cab check part 2: check oil pressure gauge for increasing or normal pressure |
| pre-trip 6 | cab check 3: check steering wheel for looseness |
| hydraulic brake check | pump pedal 3 times |
| air brake check: external | first check air compressor drive belt in engine compartment; check brake adjustment on s-cams |
| air brake check: in cab | turn off engine |
| air compressor cut out/in pressure tests | run engine at fast idle -- should cut out at 130psi; pump brakes slowly -- should cut in at 85psi; low air pressure warning must activate between 55psi and 75 psi |
| trailer brakes | chock wheels; release parking brakes; engine off; pump brake -- trailer air supply valve knob should pop out w/20-40psi |
| air pressure buildup | from 85 to 100psi 45 seconds in dual air sys; from 50 to 90psi in single air sys |
| test service brakes | normal air pressure; release parking brake; move fwd 5mph; firmly apply brakes: no pulling to side |
| test parking brakes | buckle up; set brake; try to move gently -- shouldn't move |
| combo vehicle air brakes check | set parking brake and/or chock wheels; normal air pressure; use trailer hand brake; open emergency line shut-off valve end of last trailer (listen for air escaping); close valve; open service line valve (pressure goes through all trailers); close valve; s |
| tractor protection valve | after combo brake check |
| trailer emergency brakes | normal pressure |
| trailer service brakes | normal air pressure; release parking brakes; move forward slowly; apply trailer brakes with johnson bar; feel brakes come on |
| pre trip 3 continued (detailed external inspection) | lights/reflectors clean and functional; steering box secure |
| pre trip 3 continued (sides/rear) | door/mirrors/windows -- hinges |
| pre trip 3 continued (coupling) | air/electric lines no leaks |
| pre trip 3 continued (trailer) | air connections sealed |
| backing up | look from outside first; slowly; back and turn toward driver side; when backing straight truck turn wheel direction you want to go; backing trailer turn wheel opposite direction |
| shifting | release accelerator |
| warning devices when stopped on side of road | 2 lane road w/traffic both directions: 10 feet of front or rear corners |
| speed/stopping distances | total stopping distance = perception (3/4 sec or 60ft at 55mph) + reaction (3/4 sec or 60 ft) + braking (4 3/4 sec or 170 ft at 55mph); additional lag distance for air brakes = 32 feet at 55mph; when you double speed = 4x stopping distance; empty trucks n |
| right turns | turn wide as you complete the turn |
| space around vehicle while driving | centered in lane; know max heights -- overpass height could be lower than posted if road repaved; empty van higher than loaded; check space below esp. before crossing tracks |
| downhill driving | use engine brakes; apply brakes just hard enough to feel slowdown; slow to 5mph velow safe speed; release brakes and wait til you're going over safe speed; repeat |
| turning quickly and safely | no brakes while turning; turn no more than necessary; prepare to countersteer |
| controlled braking | apply brakes as hard as you can w/o wheels locking |
| alcohol | BAC limit 0.04% |
| inspect cargo | after 3 hours driving or 150 miles |
| loading cargo | balance in center |
| glad hands | hose couplers for air brakes -- keep couplers clean |
| air tanks | drain out water or oil daily using drain valves |
| jackknife | happens when tractor or trailer wheels lock -- causes trailer to swing out; check mirrors to identify and stop trailer skid asap; take foot off brake |
| coupling | inspect fifth wheel -- no damaged/missing parts |
| uncoupling | position rig straight; ease pressure on locking jaws by shuting off trailer air supply |
| tank vehicles | 10 hour driving time limit; high center of gravity; liquid surge; baffled tanks have compartments in tanks w/holes to slow surge; never load tank completely full |
| hazmat | driver checks that shipper has id'd |
| loading hazmat | must have attendant w/in 25 feet; have clear view; close manholes and valves before moving; turn off engine before loading any explosives or flammables; unhook all connections and chock wheels before loading/unloading chlorine tank |
| driving and parking hazmat | can't park w/explosives within 5 feet of traveled part of road |
| Controlled braking: | Is used to keep a vehicle in a straight line when braking. |
| You are driving a long vehicle that makes wide turns. You want to turn left from one street into another. Both are two-lane | two-way streets. You should: |
| After starting the engine | the: |
| Which of these statements is true about cargo types? | Unstable loads (i.e |
| Why is a broken exhaust system dangerous? | Poisonous fumes could enter the cab or sleeper berth. |
| Which of these is true about a vehicle's overhead clearance? | Cargo weight can change your vehicles height. |
| Truck escape ramps: | Help avoid damage to vehicles. |
| Which of these is NOT a good rule to follow when caring for an injured person at an accident scene? | Keeping injured persons cool. |
| Which of these is especially true about your tires in hot weather? | You should check tire mounting and air pressure before driving. |
| When you are passing another vehicle | pedestrian |
| To determine a person's blood alcohol concentration | you must know how: |
| You are driving a new truck with a manual transmission. What gear will you probably have to use to take a long | steep downhill grade? |
| If you need to leave the road in a traffic emergency | you should: |
| When driving through roadway work zones | you should: |
| Merging onto a road is safest if you: | Wait for a large enough gap in traffic to enter the road. |
| Which of these statements is true regarding the use of drugs while driving? | Prescription drugs are allowed if a doctor says the drugs will not affect safe driving ability. |
| CDL medical certificates must be renewed every: | Two years. |
| Which of these statements is true about speed management? | On slippery roads |
| What three things add up to the total stopping distance for your truck or bus? | Perception distance |
| Which of these happen when a tire blows out at highway speeds? | A vibrating feeling. |
| When the roads are slippery | you should: |
| You are driving a 40 foot vehicle at 35 mph. The road is dry and visibility is good. What is the least amount of space that you should keep in front of your vehicle to be safe? | 4 seconds. |
| Which of these lights cannot be checked at the same time? | Turn signals |
| Which of these statements is true about double-clutching and shifting? | You can use the Tachometer to tell you when to shift. |
| Which of these systems should receive extra attention during a winter weather inspection? | Exhaust. |
| You are checking your steering and exhaust systems in a pre-trip inspection. | Steering wheel play of more than 10 degrees (2 inches on a 20-inch steering wheel. |
| Which of these items is NOT checked in a pre-trip inspection? | Fuel level. |
| What should you do when your vehicle hydroplanes? | Release the accelerator. |
| Which of these statements is true about rear drive wheel braking skids? | Trailers can push the towing vehicle sideways. |
| How does vehicle weight affect stopping distance? | Empty trucks can take longer to stop than loaded trucks. |
| When hydraulic brakes fail | the system won't build up pressure and the brake pedal will feel spongy or go to the floor. What action should you take? |
| Which of these statements is true about warning other drivers of a stopped vehicle? | Move the rear reflective triangle back if the driver's vision is obscured within 500 feet. |
| You are driving on a straight | level highway at 50mph with no vehicles in front of your. Suddenly a tire blows out on your vehicle. What should you do first? |
| According to the Commercial Driver Handbook | why should you limit the use of your horn? |
| You should use your mirrors to check: | Where the rear of your vehicle is while you make turns. |
| Which of these statements is true about brakes? | Brakes absorb more heat to stop heavier or faster-moving vehicles. |
| You are driving a heavy vehicle with a manual transmission. You have to stop the vehicle on the shoulder while driving on an uphill grade. Which of these is a good rule to follow when putting the vehicle back in motion. | Use the parking brake to hold the vehicle until the clutch engages. |
| The total weight of the power unit | the trailer |
| Which of these statements is correct about emergency or evasive action? | To turn quickly |
| The purpose of retarders is to: | Help slow the vehicle while driving and reduce brake wear. |
| If you're not sure how to put out a hazardous materials fire | you should: |
| Where must you keep shipping papers when transporting hazardous materials? | In a pouch on the driver's door or on the seat. |
| Which of these statements is true about bad weater driving conditions? | When the temperature drops |
| Which of these is usually true about driving in tunnels? | There may be strong winds when exiting. |
| You are driving in heavy traffic at 35 mph. The speed limit is 55 mph. The safest speed for your vehicle is: | 35 mph. |
| How far should a driver look ahead of the vehicle while driving? | 12-15 seconds. |
| Which of these statements is NOT true about backing a heavy vehicle? | You should back slowly until you slightly bump into the dock. |
| Take extra care to keep your vehicle centered in your lane because commercial vehicles: | Are often wider than other vehicles. |
| Which of these statements is true about causes of vehicle fires? | Poor trailer ventilation can cause flammable cargo to catch on fire. |
| Which of the following statements is true? | Many heavy vehicle accidents occur between midnight and 6am. |
| Excessive use of the service brakes results in overheating | which can lead to: |
| The air brake system for a straight truck or bus should not leak at a rate of more ____ psi per minute with the engine OFF and the brakes released. | 2 psi |
| If air pressure does NOT build up to normal within the correct amount of time: | Your air pressure may drop too low during driving. |
| If you must make an emergency stop | you should brake so you: |
| The proper method of braking when going down long and/or steep grades | after selecting the proper gear |
| Your truck or bus has a dual air brake system. If a low air pressure warning comes on for only one system. what should you do? | Stop and safely park. Continue only after the system is fixed. |
| The driver must be able to see a warning before air pressure in the service air tanks falls below _____ psi. | 60. |
| The brakes pedal in air brake systems: | Controls the air pressure applied to put on the brakes. |
| The parking or emergency brake on a heavy vehicle can only be held in position by something that cannot leak away | like: |
| Before driving a truck or bus with a dual air brake system | the pressure in each system should be at least ___ psi. |
| The brake system that applies and releases the brakes when the driver uses the brake pedal is the ____ brake system. | Service. |
| To check the free play of manual slack adjusters on S-cam brakes | |
| If your truck or bus has dual parking control valves | you can use pressure from a separate tank to: |
| Under normal conditions | to engage the parking brakes the driver must first: |
| The air compressor governor controls: | When air is pumped into the air tanks. |
| Total stopping distance for vehicles with air brakes is longer than that for vehicles with hydraulic brakes due to ____ distance. | Brake lag. |
| Some air brakes systems have an alcohol evaporator. What may happen if you don't keep the unit filled with alcohol? | Ice may form in the air storage tanks and cause the brakes to fail. |
| What is emergency stab braking? | Brake hard |
| How should you check that your service brakes are working properly? | Wait for normal air pressure |
| Which of these is NOT a proper time to apply the parking brakes? | When you come down a steep grade and your brakes are very hot. |
| If you have a heavy load that is slowing you down on an upgrade | you should: |
| The best drivers are those who watch and prepare for hazards. This is called being: | Defensive. |
| You are stopped. You want to start driving uphill. You should: | Partly engage the clutch and then release the parking brake. |
| Which of the following may be a sign of tire failure? | Wheels fishtailing. |
| Which of the following is NOT a type of retarder? | Robotic. |
| Which of these systems should receive extra attention during a winter weather inspection? | Exhaust. |
| To avoid a crash | you had to drive onto the right shoulder. You are now driving at 40 mph on the shoulder. How should you move back onto the pavement? |
| Which of these is NOT a proper use of vehicle lights? | Flashing your brake lights to stop someone from tailgating. |
| Which of these statements is NOT true about backing a heavy vehicle? | You should back slowly until you slightly bump into the dock. |
| You are checking your brakes and suspension system during a pre-trip inspection. Which of these statements is true? | Brake shoes should not have oil |
| The braking effect of the engine is greatest when the engine is ____ the governed RPM and the transmission is in the ____ gears. | Near |
| Whenever you double your speed | it will take about ____ times as much distance to stop. |
| You should try to park your vehicle so: | You can pull forward when you leave. |
| You are checking your tires during a pre-trip inspection. Which of these statements is true? | Tires of mismatched size should not be used on the same vehicles. |
| Controlled braking: | Is used to keep a vehicle in a straight line when braking. |
| Which of the following statements is true? | Many heavy vehicle accidents occur between midnight and 6AM |
| Optional safety equipment may include emergency phone numbers | tire chains |
| You see a sign that has a triangle outline on it. What does it mean? | Slow-moving vehicle. |
| The Commercial Driver Handbook suggests several things to do when you pass a vehicle. Which of these is NOT one of them? | At night |
| If you must drive into the oncoming lane to turn | you should: |
| Which of these statements is true about shipping hazardous materials? | A four-inch |
| When you must stop on a one-way or divided highway | you should place your reflective triangles at which of the following locations? |
| The distance that you should look ahead of your vehicle while driving is about ____ mile at a highway speeds. | 1/4. |
| What should you do if a car coming toward you at night keeps its high beams on? | Look to the right edge of your lane or right side of the road. |
| Retarders: | Can cause the drive wheels to skid when they have poor traction. |
| Which of these statements is NOT true about engine belts in hot weather? | Cracking is likely to occur but is not a safety threat. |
| If you do not have a CB radio | what is the first thing you should do at an accident scene? |
| What is the first thing you should do if your brakes fail while driving downhill? | Get off the road as soon as possible. |
| You are driving a 40 foot vehicle at 35 mph. The road is dry and visibility is good. What is the least amount of space you should keep in front of your vehicle to be safe? | 4 seconds. |
| If a straight vehicle (no trailer or articulation) goes into a front-wheel skid | it will: |
| What is the best advice for drivers to follow when a heavy fog occurs? | Park at a rest area or truck stop until the fog has lifted. |
| How do you correct a rear wheel braking skid when driving on ice or snow? | Stop accelerating. |
| CDL medical certificates must be renewed every: | Two years. |
| What should you do before driving in the mountains? | Know the escape ramp locations on your route. |
| For your safety | when you place your reflective triangles you should: |
| One reason that dry bulk tanks require special care is: | The load can shift. |
| Which of these statements is true about double-clutching and shifting? | You can use the tachometer to tell you when to shift. |
| Which of these statements is the proper way to signal for a lane change? | Signal early |
| How far should a driver look ahead of the vehicle while driving? | 12-15 seconds. |
| What will help keep an engine cool in hot weather? | Making sure the engine has the right amount of oil. |
| Which of these is a good thing to do when you steer to avoid a crash? | Don't turn the steering wheel any more than needed. |
| Which of these statements is true about transported hazardous materials? | Hazardous materials can be a risk to health and safety. |
| When you drive in the mountains | you will have to use lower gears to drive safely down grades. Which of these does NOT affect your choice of gears? |
| You wish to turn right from a two-lane | two-way street into another. Your vehicle is so long that you must swing wide to complete the turn. How should you maneuver this? |
| When do strong winds affect driving the most? | When exiting tunnels. |
| "Perception distance" is the distance your vehicle travels from the time your: | Eyes see a hazard to the time your brain knows it is a hazard. |
| How many missing or broken leaves in any leaf spring will cause a commercial vehicle to be placed out of service? | One fourth of the total number. |
| Which of the following is NOT true? | A drinker can control how fast his or her body absorbs and gets rid of alcohol. |
| Which of these is NOT caused by rough acceleration? | Tire damage. |
| Which of these is a good thing to remember about drinking alcohol? | Alcohol first affects judgment and self-control. |
| A tractor with a(n) ____ trailer requires the shortest stopping distance: | Fully loaded. |
| You should not back a tractor under a trailer until the whole air system is: | At normal pressure. |
| You are coupling a tractor semitrailer of a semitrailer. You have backed up but are not under it. What should you hook up before backing under the semitrailer? | The emergency and service air lines. |
| When should you use chocks to park a trailer not equipped with spring brakes? | Always. |
| When you are uncoupling a loaded trailer | lower the landing gear until it: |
| Under good driving conditions | you should leave at least one second of space between your vehicle and the vehicle ahead for every ____ feet of your vehicle's length. |
| You want to inspect the trailer support. You should place the tractor transmission in which gear after you have uncoupled the trailer? | Neutral. |
| You are driving a combination vehicle. If the service air line comes apart but the emergency line stays together | what will happen right away? |
| You are coupling a semitrailer to your tractor but have not yet backed under it. The trailer is at the right height when: | It will be raised slightly when the tractor is backed under it. |
| You are driving a combination vehicle. The trailer breaks away and pulls apart both air lines. You would expect the trailer brakes to come on and the: | Tractor protection valve to close. |
| In general | the higher your truck's "center of gravity" |
| After you supply air to the trailer | make sure the air lines are not crossed and the trailer brakes are working. You do this by: |
| You have uncoupled a trailer and you want to inspect the landing gear. The tractor should be positioned: | With the tractor frame under the trailer. |
| Which of these statements is true? | "Bobtail" tractors can take longer to stop than a combination vehicle. |
| When checking the trailer's emergency brakes | the tractor protection control valve should be placed in the ____ position. |
| One of the things a driver can do to prevent a rollover is to keep: | The cargo as close to the ground as possible. |
| You have a major leak in the service line and you put on the brakes. Service air pressure will escape and cause the: | Trailer emergency brakes to come on. |
| After the trailer has been coupled to the tractor | the tractor protection control valve should be placed in the ____ position. |
| The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the ____ brake line. | Emergency. |
| The air leakage rate for a combination of two vehicles (engine off | brakes off) should not be greater than ____ psi or less in one minute. |
| If you cannot make a turn without entering another traffic lane | you should: |
| Before you back under a truck trailer | make sure the: |
| After you lock the kingpin into the fifth wheel | you should check the connection by pulling: |
| What will happen if the air lines are crossed when you hook up to an old trailer with no spring brakes? | You could drive away with no trailer brakes. |
| To stop a trailer skid | you should: |
| Loss of air pressure in the emergency line causes: | The trailer's emergency brakes to come on. |
| To prevent a jackknife in normal driving | some drivers use the hand valve before stepping on the brake pedal. Which of these statements is true? |
| You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes | you should: |
| When you get ready to back under a trailer | you should line up: |
| You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is: | At normal pressure. |
| How should you check that the trailer brakes come on when air pressure in the system drops below a certain level? | Chock the wheels |
| Truck and bus parking or emergency brakes must be held on by: | Mechanical force. |
| You should know your brakes are fading when: | You have to push the brake pedal harder to control speed on a downgrade. |
| What is emergency controlled braking? | You apply the brakes as hard as you can without locking the wheels. |
| For air brake systems in good condition | the air compressor should start pumping at about ____ psi |
| The braking power of the spring brakes: | Depends on the service brakes being in adjustment. |
| In air brake vehicles | the parking brakes should be used: |
| The driver must be able to see a low air pressure warning which comes on before pressure in the service air tanks falls below ____ psi. | 60. |
| If the spring brakes are on | when should you push the brake pedal? |
| The most common type of foundation brake found on heavy vehicles is the: | S-cam drum. |
| If your truck's air compressor has it's own oil supply | when should you first check the oil level? |
| The air compressor governor controls: | When air is pumped into the air tanks. |
| If your truck or bus has dual parking control valves | you can use pressure from a separate tank to: |
| You are on a steep downgrade and have reached your "safe" speed of 40 mph. You would apply the services brakes until your speed drops to: | 35 mph. |
| If your truck has a dual air system and one of the systems is low on pressure: | Either the front or rear brakes will not be fully operational. |
| The brake pedal in an air brake system: | Controls the air pressure applied to put on the brakes. |
| Repeatedly pressure and releasing (fanning) the brake pedal may result in: | The loss of brake air pressure. |
| The air brake lag distance at 55 mph on dry pavement adds about ____ feet to your stopping distance. | 32. |
| The air loss rate for a straight truck or bus with the engine OFF and the brakes on should not be more than: | 3 psi in one minute. |
| The stop light switch: | Turns on the brake lights to warn drivers behind you. |
| You supply air to the trailer tanks by: | Pushing in the trailer air supply valve. |
| A driver crosses the air lines when hooking up to an old trailer with no spring brakes. What will happen? | The driver could drive away with no trailer brakes. |
| Glad hands are used to connect the: | Service and emergency air lines from the truck to the trailer. |
| After you connect the air lines | but before you back under the trailer |
| To unlock the fifth wheel | pull the release handle to the ____ position. |
| For a coupling to be complete | the safety catch for the fifth wheel locking lever must be: |
| Which part of the kingpin should the locking jaws close around? | The shank. |
| Why should you be sure that the fifth wheel plate is greased as required? | To prevent steering problems. |
| When should you use the hand valve to park a combination vehicle? | Never. |
| The trailer air supply control (or Tractor protection valve control) should automatically close when the air pressure falls to between ____ psi. | 20 and 45. |
| The best way to tell if your trailer has started to skid is to: | See it in your mirrors. |
| When coupling | the proper position of the fifth wheel is: |
| A trailer is most likely to jackknife when it is: | Empty. |
| If the spring brakes don't release when you push the trailer air supply control | you should: |
| The front trailer supports are up and the trailer is resting on the tractor. Make sure: | There is enough clearance between the tractor frame and landing gear. |
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