This document contains information about calculating reaction and braking distances for a vehicle. It provides formulas to estimate reaction distance based on speed and braking distance based on speed and road surface conditions. It also includes examples calculating reaction distance for a driver traveling at 50 mph and estimating braking distance using provided road surface factors.

1. braking distance.notebook
February 07, 2014
Objective: Calculate reaction and braking dist
16.13 mph
14.25 mph
12.59 mph
11.62 mph
Jan 30­5:48 PM
HW worksheet
1

2. braking distance.notebook
February 07, 2014
Reaction Distance:
distance a car travels during the time it takes a driver to
brake the car.
You can use the following formula to estimate reaction distance.
d = 1.1 x r
r = speed in mi/hr
d = reaction distance in feet
Example 1: Dan is driving at 50 miles per hour on a dry asphalt road.
Estimate the reaction distance.
Jan 30­6:13 PM
HW worksheet
2

3. braking distance.notebook
February 07, 2014
Braking Distance:
the distance traveled by a car after the driver brakes and unt
the car stops completely. You can use the following formula to estimate bra
distance.
b = x r b = braking distance in feet
r
30 x F
F = driving surface factor
Example 2: Use the table to estimate Dan's braking distance from Example
nearest foot.
Type of
Driving Surface Factor
Surface
Dry Road
Wet Road
Asphalt
0.85
0.65
Concrete
0.90 0.60
Gravel
0.65 0.65
Packed
0.45 0.45
Snow
Jan 30­6:18 PM
HW worksheet
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4. braking distance.notebook
February 07, 2014
Worksheet pg. 241 #1­23 a
Jan 30­6:27 PM
HW worksheet
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