60 MPH = 88 fps. (fps=1.467 * MPH). If the vehicle deceleration rate is 20 fpsps (rather than the previously calculated 15 fps), then stopping time = 88/20 = 4.4 seconds. Since there is a 1 second delay (driver reaction time) in hitting your brakes (both recognition and reaction time is often 2 seconds), the total time to stop is 5.4 seconds to 6.4 seconds.
To determine how far the vehicle will travel while braking, use the formula of 1/2 the initial velocity multiplied by the time required to stop. In this case, this works out to be .5 * 88 * 4.4 = 193.6 feet, plus a reaction time of either 88 feet for a second delay in reaction time, or 176 feet for two seconds reaction time. That yields 281.6 feet or 369.6 when added to the base stopping distance of 193.6 feet. If the driver is very responsive and takes only a half a second to react, the distance is reduced to 237.6 feet. Notice that the reaction time is a huge factor since it is at initial velocity.
Roughly 96 Klms per hour, note 1/2 second reaction time. This is assuming a normal vehicle with good tires and brakes. On a good roiad surface, no oil or water.
Rare for someone to have that kind of reaction time, one second for most of us would probably be more accurate. Now figure how much more distance for a heavy truck stop. I think it's to imagine that 6.4 seconds is far to short of a time to stop in a truck traveling 90 Klms an hour. Time the amper lights at out intersections on Ring Raod adn it;s eay to see why run light are ran even by good drivers.
Good reason to check both direction even on a green light before entering a intersection. I doubt any intersection in Udon has a sufficient enough amber phase to stop safely at the speed limit.