11 Tire Safety Flashcards
Contact patch
The part of the tire in contact with the road
The contact patch is one of the most important safety components of a vehicle
Most tires blow out because they are __________, causing them to overheat and explode.
Underinflated
Proper inflation:
Flat contact patch
Under inflation
Contact patch cups - edges touch while middle sucks in
Over inflated
Contact patch U’s - middle touches while edges pull up
The speed at which a vehicle will hydroplane depends on 3 factors:
- Tire Tread Depth
- Air Pressure
- Depth of water
Tire Tread Depth
Front Steering Axle: 4/32”
Back non-steering Axles: 2/32”
Tires with less than 5/32” tread depth will have
significantly longer stopping distance in wet weather.
What is the best method for determining the proper air pressure for tire?
Have the vehicle weighed and determine how much weight each tire is supporting.
Dual tires should differ no more than ___________ in diameter and __________ in circumference.
1/4” / 3/4”
Handling front left tire blow out:
Truck loses control to left
Veers into oncoming or adjacent traffic
Rolls over immediately or after a collision
Crashes are primarily multi-vehicle crashes
Handling front right tire blow out:
Truck loses control to the right
Veers of the road and rolls or collides with roadside structures
Typically single-vehicle crashes
The proper response to a tire blowout is to ____________ and keep the vehicle in a straight line.
Accelerate
Once vehicle is back under control, gently decrease speed and come to a controlled stop
NFPA 1911 standard further states that the maximum life of a tire shall be no more than ___________.
7 years
