- 5 seconds
- 6.5 seconds
- 4 seconds
- 3.5 seconds
Quote From Page 31 Of The Illinois CDL Manual:
One good rule for how much space you should keep in front of you is at least 1 second for each 10 feet of vehicle length at speeds below 40 mph. At greater speeds, you must add 1 second for safety.
A question regarding safe following distance will very likely show up on your written exam. Be sure to understand the safe driving distance formula.
- These are not safe speeds for large or heavy vehicles
- The speeds are safe for empty trucks
- The signs are generally posted at 10mph under the actual safe speed
- The speeds are designed to be safe for large trucks
Quote From Page 40 Of The Illinois CDL Manual:
Offramps/onramps: Freeway and turnpike exits can be particularly dangerous for commercial vehicles. Offramps and onramps often have speed limit signs posted. Remember, these speeds may be safe for automobiles but may not be safe for larger vehicles or heavily loaded vehicles. Exits that go downhill and turn at the same time can be especially dangerous. The downgrade makes it difficult to reduce speed. Braking and turning at the same time can be a dangerous practice. Make sure you are going slow enough before you get on the curved part of an offramp or onramp.
- Require a special license endorsement when transported in large quantities
- All of these answers are correct
- Pose a risk to health, safety, and property during transportation
- Require special load securement and containment
Quote From Page 49 Of The Illinois CDL Manual:
All drivers should know something about hazardous materials. You must be able to recognize hazardous cargo and whether or not you can haul it without having a Hazardous Materials Endorsement added to your CDL license.
Hazardous materials are products that pose a risk to health, safety and property during transportation.
- All of these are correct
- Engage the parking brake and only release it when you have applied enough engine power to keep from rolling back
- On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be applied to keep from rolling back
- Partly engage the clutch before you take your right foot off the brake
Quote From Page 23 Of The Illinois CDL Manual:
Do not roll back when you start. You may hit someone behind you. Partly engage the clutch before you take your right foot off the brake. Put on the parking brake whenever necessary to keep from rolling back. Release the parking brake only when you have applied enough engine power to keep from rolling back. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be applied to keep from rolling back.
- A heavily loaded truck will take longer to stop than an empty truck.
- The heavier the vehicle, the more work the brakes must do to stop it and the more heat they absorb
- The brakes, tires, springs and shock absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded.
- Empty trucks require greater stopping distances, because an empty vehicle has less traction
Quote From Page 29 Of The Illinois CDL Manual:
The heavier the vehicle, the more work the brakes must do to stop it and the more heat they absorb. But the brakes, tires, springs and shock absorbers on heavy vehicles are designed to work best when the vehicle is fully loaded. Empty trucks require greater stopping distances, because an empty vehicle has less traction. It can bounce and lock up its wheels, giving much poorer braking. (This is not usually the case with buses.)
This type of question is frequently asked on written exams. Understand that truck braking systems are designed for when the truck is fully loaded. An empty or very light truck will actually take longer to stop than a fully loaded and heavy truck.
- Pour cold water on the tire
- All of these can be done to reduce the risk of a tire blowout from overheating
- Wait for the tire to cool down
- Let air out of the tire until the pressure returns to normal
Quote From Page 37 Of The Illinois CDL Manual:
Check the tire mounting and air pressure. Inspect the tires every two hours or every 100 miles when driving in very hot weather. Air pressure increases with temperature. Do not let air out or the pressure will be too low when the tires cool off. If a tire is too hot to touch, remain stopped until the tire cools off. Otherwise the tire may blow out or catch fire. A burning tire should be cooled with water.
Be extra vigilant about your tires while driving through deserts or in very hot weather. Tires can get extremely hot resulting in blowouts or tire fires. Tire debris on the roadway becomes much more common during the hot summer months.
- Flash your brake lights to communicate you want the vehicle behind you to open their following distance
- Speed up to increase the distance between yourself and the vehicle behind you
- None of these answers are correct
- Make a quick lane change
Quote From Page 32 Of The Illinois CDL Manual:
If you are being tailgated, do the following to reduce the chances of an accident: Avoid quick changes. If you have to slow down or turn, signal early and reduce speed very gradually. Increase your following distance. Opening up room in front of you will help you avoid having to make sudden speed or direction changes. It also makes it easier for the tailgater to get around you. Do not speed up. It is safer to be tailgated at a low speed than a high speed. Avoid tricks. Do not turn on your taillights or flash your brake lights. Follow the suggestions above.
- Assist the injured after you have protected the area, but before you have notified authorities
- Assist the injured only after you have protected the area and notified authorities
- You should never assist the injured until authorities have arrived
- Assist the injured immediately
Quote From Page 45 Of The Illinois CDL Manual:
If a qualified person is at the accident and helping the injured, stay out of the way unless asked to assist. Otherwise, do the best you can to help any injured parties:
- Do not move a severely injured person unless the danger of fire or passing traffic makes it necessary.
- Stop heavy bleeding by applying direct pressure to the wound.
- Keep the injured person warm.
If you are the first one on the scene of a serious accident, you may want to help the injured right away. But make sure you secure the scene of the accident first to avoid any additional collisions. You should then notify the authorities before attempting to assist an injured person. Make sure you memorize the order of recommended accident procedures:
1. Protect the area
2. Notify authorities
3. Assist the injured