Speed limit signs can either fade into the background or startle us to attention, often depending on how fast we might be going. Familiarity plays a role too. We expect to see 25 mph in a quiet residential neighborhood and 55 or 65 mph on a busy highway . But what if you were driving along and saw 8.2 mph, or 14.4? Most speedometers don’t even display tenths of a mile per hour, so how is a driver supposed to follow a rule of the road like that? It sounds ridiculous, and it is a bit uncommon, but speed limits expressed in decimals definitely do exist. To explain what’s going on, Reader’s Digest reached out to Michael Knodler, PhD, a professor of civil and environmental engineering at the University of Massachusetts Amherst and the director of the UMass Transportation Center. Read on to find out the purpose behind these unusual speed limits and whether they might soon appear on a road near you . Get Reader’s Digest ’s Read Up newsletter for more...
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