How it Works> Measuring Drag Factor> Exemplar Vehicles

Normal Conditions for Exemplar Vehicle Testing (f)

 

exemplar vehicle 1. Exemplar Vehicle

a. Test vehicle must have good brakes with proportioning valve
working properly.
b. Use 4 wheel ABS enabled test vehicle to replicate 4 wheel
ABS accident vehicle. A braking speed of 45 mph is recommended
for speed calculations over 45 mph.
c. Use Vehicle with standard brakes or disabled ABS to replicate accident vehicle with standard brakes. A 30 mph braking speed is recommended.
tires
2. Tires

a. Use OEM all season passenger tires or equivalent.
b. 17 psi and up does not affect friction value.
c. Snow tire may vary friction value.
minimum test speeds
3. Minimum test speeds

a. 45 mph for ABS vehicles.
b. 30 mph for vehicles with standard brakes.
road surface
4. Road surface

a. Well maintained paved or concrete surface with a harsh microtecture.
b. Dry surface clear of debris.
brake pedal force/rate
5. Brake pedal force / rate

Apply 45 lbs within .020 seconds.
ambient temperature
6. Ambient temperature

a. 55° F to 85° F normal range.
b. Below 32°F or above 104°F may decrease f by 4%.
payload
7. Payload

Full payload can decrease f by 5% on some vehicles.
Normal Conditions for Exemplar Vehicle Testing (f)

 

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