@rasterweb The sad part is this is how speed limits are actually set.

“Texas, like many other states around the country, sets speed limits on state roadways using the “85% rule.” Basically, the Department of Transportation comes out to a highway, monitors how fast everyone is going in a speed survey, and sets the new speed limit at the 85th percentile.

If you think about it, if 85% of drivers stay just over the speed limit, that speed limit would creep up over time under the 85% rule.

Once DOT engineers determine the speed of the 85th percentile, they’ll round the number to the nearest 0 or 5, and make that the new speed limit.”