[color=blue]If you want to measure your personal reaction time, please check out Reaction time[/color]

This applet try to demonstrate how your reaction time related to car accident. May be you prevent the car accident, but those car behind you might have car accident due to your slower response.

There are 10 cars in a row, all moving in the the same direction with  the same speed.

You are the  driver of the [b]second[/b] car.

When the first car brakes, its color will turn from yellow to red,

(left)CLICK the mouse button to stop your car.

The average reaction time for the other drivers is control by the value of the T= field_value + 0.1 *random seconds.

The default is 0.5 s which means the reaction time for all the drivers are between 0.5 and 0.6s

You reaction time will determine if an accident will happen or not.

(and how many cars will be involved in the incident)

move mouse cursor inside simulation region,
[size=14pt][b]click [u]left mouse button[/u] when the color of the first car turn [color=red]red[/color][/b][/size]

Usage:
You can enter different speed with selected unit.( m/s, km/hr, mi/hr)

distances d between cars and

the friction coefficient of the tire and the road. (0.8 will be a good value for normal situation)

The graph show the velocity for all the cars.

If the car turn red, you know what happened to it.

Subject: Reaction time & car accident
Date: Sun, 24 Oct 1999 21:00:03 +0100
From: "Ray Holloway" middx@middx.screaming.net
To: hwang@phy.ntnu.edu.tw

Hi
I have only just found your wonderful web-site & have tried the
accident experiment, it really is a good lesson for us drivers.Perhaps it should be included in driving tests.
I had not appreciated the "knock on" effect until I noticed that although I could stop in time those behind me could not.
I found that at 100 mph I had to allow 75 feet between cars for them
all to stop & even then it was not succesful every time. A wet road would of made it much worse.
Thanks for a very interesting site, although I have no formal education
in Physics I find it fascinating, so I am going to try the other experiments now.
Regards, Ray Holloway

ray@middx.screaming.net