AMBER Light Project

Through all the strange conversations, rambling, and whistling we some how managed to also get a video of our intersection. However, Blogger thought it was so cool that it decided to keep the video for itself.

Grover and Koenig:

• Amber light time = 3.9s
• Posted speed limit 30mph
• Average practicle speed 35mph = 51.3 ft/s
• Average safe breaking distance at 35mph = 80 ft

Acceleration while stopping from 35mph over 80ft:
t= ∆d/v
t= 80 ft/(51.3 ft/s)
t= 1.56s
a= ∆v/∆t
a= (-51.3 ft/s)/1.56s
a= -32.9 ft/s/s
G-forces felt:
1G-force = -9.81m/s/s
1m=3.2808399ft
-9.81 m/s/s= -32.19 ft/s/s
(-32.9 ft/s/s)/(-32.19 ft/s/s)
1.02 Gs
This is a safe amount of force to feel.
Amber light safety:
At 35mph, given 3.9s of yellow light to make it into the intersection you would cover a distance of 200.2 ft.

∆x= (v)t

∆x= (51.3 ft/s)(3.9s)

∆x= 200.2 ft

As such, if one is below 200.2 ft they will be able to make it into the intersection without accelerating, if one is over 200.2 ft they will have to start breaking over that distance. Would these G-forces felt be safe? Yep.

t= ∆d/v
t= (200.2 ft)/(51.3 ft/s)
t= 3.903s
a= ∆v/∆t
a=(-51.3 ft/s)/(3.903s)
a= -13.15 ft/s/s
1G-force = -9.81 m/s/s
1 m= 3.2808399 ft
-9.81 m/s/s= -32.19 ft/s/s
(-13.15 ft/s/s)/(-32.19 ft/s/s)
.41 Gs
Members/Works Cited:
Louk Cox, Philip Franke, Jesse Purrington, Carter Wise
http://www.csgnetwork.com/stopdistinfo.html