Stoplight Data
Location: Madison Ave. & 27th St.
Granite City, IL 62040
38.711162° N, -90.13194° W
System: American Traffic Solutions (ATS).
Cameras on Madison Ave only.
Threshold just prior to the stop bar(1),
Stop to Threshold approximately 0.
(1) ATS_FAQ.pdf

Yellow Time = 4.00 seconds (± 0.03 s)


Driver and Vehicle
1)Reaction Time: 2.3 seconds
2)Vehicle Length:15 feet
Stop Light and Road
3)Speed Limit: 35 mph
4)Yellow Duration: 4 seconds
5)Stop to Threshold Line:0 feet
6)Road Grade: 0 %

Worse Case Distance
From Stop Line
190 feet (63 yards)
Brake from 35 to 0 mph
Braking = 0.57 g's
Deceleration = 18.2 ft/s2
= 12.4 mph/sec
Braking Distance = 72 feet
Braking Time = 2.82 seconds
Dangerous Braking
Above Average Driver Maximum
> 0.45 g's

Timeline and Distances
35 mph
C
H
A
N
G
E
S

Y
E
L
L
O
W
React
118 feet
2.3 seconds
Brake
72 feet
2.82 seconds
0.57 g's
S
T
O
P
190 feet
5.12 seconds
Continue - Violation P
H
O
T
O
35 mph = 51.3 ft/s
205 feet
4 seconds
190 feet
3.71 seconds
15 feet
0.29 sec
0% Road Grade

OBSERVATION
The intersection is dangerous using a midsize car and an average driver reaction time of 2.3 second. The intersection would be safe for a midsize car and a driver reaction time of 1.4 seconds, a pickup truck or van would require hard unsafe braking.


CopRadar.com
Red Light Camera Timing Issues

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