High Road Air Brakes Question
Topic 17586 | Page 1
This same question gets asked periodically. I think the deal is that all the states start with the same "model" cdl manual from the federal government, but some of them have edited that section for some reason (maybe because the model manual is wrong, I'm not sure). You should look at the manual for your state and see what is says. In any case, you're not missing anything.
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles:
- Any combination of vehicles with a gross combined weight rating (GCWR) of 26,001 or more pounds, providing the gross vehicle weight rating (GVWR) of the vehicle being towed is in excess of 10,000 pounds.
- Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing another not in excess of 10,000 pounds.
- Any vehicle, regardless of size, designed to transport 16 or more persons, including the driver.
- Any vehicle required by federal regulations to be placarded while transporting hazardous materials.
New Reply:
New! Check out our help videos for a better understanding of our forum features
Preview:
Why Join Trucking Truth?
- The High Road Training Program
- The High Road Article Series
- The Friendliest Trucker's Forum Ever!
- Email Updates When New Articles Are Posted
Apply For Paid CDL Training Through TruckingTruth
Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Seriously! The application only takes one minute. You will speak with recruiters today. There is no obligation whatsoever. Learn more and apply here:
TT On Facebook
Help me out here....
In the High Road it states:
Perception Distance + Reaction Distance + Brake Lag Distance + Effective Braking Distance ------------------------------ = Total Stopping Distance The air brake lag distance at 55 mph on dry pavement adds about 32 feet. Therefore, for an average driver traveling 55 mph under good traction and brake conditions, the total stopping distance is more than 300 feet. This is longer than a football field.
Which is all well and good, except that my SC CDL manual (and earlier in the High Road) says that Perception + Reaction + Effective = 419 feet.
Add the 32 feet for Brake lag and you have 451 feet which is what the SC manual states.
However on the High Road test, here is one of the questions:
For an average driver traveling 55mph under good traction and brake conditions, total stopping distance using air brakes will have a stopping distance of: More than 400 feet More than 550 feet More than 300 feet More than 250 feet
The correct answer is "more than 300 feet" when "more than 400 feet" is also a choice and is actually more correct it seems.
I've been studying for a while and I may very well be missing something. Help me figure out what I'm missing here, please?
Thanks guys!
CDL:
Commercial Driver's License (CDL)
A CDL is required to drive any of the following vehicles: