The Yellow Light - Iona Physics Page 2
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1
2Conservative estimate of the Stopping Ability of a standard passenger car on dry, clean, level pavement
(Including reaction time of driver.)
Speed (mi/hr)
Stopping Distance (ft)
20
44
25
59
30
78
35
97
40
124
45
153
Name ___________________________________________
Date ______________________
Data:
Intersection of (street 1) ____________________and (street 2) ___________________
Traveling (direction) ____________________ on (street) _______________________
Duration of the yellow light (average of 4 timings) _______________________seconds
Width of the intersection _________________________feet
Speed limit ____________________________mi/hr = ______________________ft/sec
Calculated values:
Actual yellow distance _____________________ft.
Required yellow distance ___________________ft.
Conclusion:
Either: The light has a dilemma zone of __________feet and should be yellow for ___________seconds.
OR: The light is properly timed
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