Area plot showing the distance to react and stop at various highway speeds


stop distance v. speed

Data on the website

table image


       The table itself is obviously difficult to interpret: the column headings are not clearly aligned with the data, the extra lines are helpful for the numbers but not the text. The table doesn't clearly show that some of the columns are simply sums of others.
        I have presented the data as an Excel 2007 'stacked area chart' that more clearly relates speed to both the time/distance required to react to a danger and the distance to physically stop.
        The insight gained is that both reaction time and stop time are a function of speed but the latter is nonliner (in fact proportional to the square of speed).


Code of Virginia § 46.2-880. Tables of speed and stopping distances. <