![]() In this article we explain what the reaction distance is and how you can easily calculate it yourself with a formula. This consists of reaction distance and braking distance. ![]() A very bright, solid-colored background works best, so that the coins appear essentially in silhouette, and their features cannot easily be distinguished.One of the most important formulas during your driver’s license training is the calculation of the stopping distance. A solid-colored background gives less distraction than an irregular background. Holding one coin in each hand, move them toward or away from your viewing eye until they appear to be the same size. You can also use the dime and quarter by themselves, without building the box, to illustrate the same principle. ![]() ![]() Now close one eye and notice that it may be much more difficult to tell whether the small disk is now actually a small disk that’s close to you, or a large disk that’s far away. Notice that you have no trouble establishing their size and distance. With both eyes open, look through the window at the disks. Position the small disk a couple of inches closer to you than the large disk. (You may have to move your head back a little from the box to get both circles focused.) Note that depth perception is now a factor and the circles no longer look the same size or the same distance away. Note that your depth perception is almost nonexistent: both circles look essentially the same distance away, and it’s very difficult to judge which circle is closest to you.įold down the viewing window and look with both eyes to see the actual positions of the circles. Push or pull on the straws from the outside rear of the box until the mounted circles appear to be the same size. Lift the end of the box cover closest to you and slide it away from you until adequate viewing light reaches the inside of the box. With your other eye, look through the viewing hole at the construction paper circles. Close one eye and look into the viewing hole with the other eye. Move the straws so that the locations of the circles is unknown. Put the cover on the box and close the hinged window.
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