Typically, no. There are some municipalities and areas of road where there is a minimum speed limit, but in the US, those are very rare. Granted, a law enforcement officer has wide jurisdiction to determine if you are 'safe' to drive and a low speed may become unsafe. But they are unlikely to ticket you and are more likely to try to help you out. Driving under the speed limit may be annoying, but it is nearly-universally not illegal.
WTF? Spoken like an inveterate speeder... it's at best equally dangerous, the effect you are speaking of happens for both higher and lower speeds. At low speeds, other cars pass you. At high speeds, you pass other cars. Either way, every pass is an opportunity for failure, and the probability is higher the higher the relative speed. However, the road, barriers, trees, etc, is always going at 0 mph, so not just the relative, but also absolute speed control crash severity. Twice the speed means 4 times the kinetic energy... speed kills.
What's your point exactly? The Quora poster's argument is just a rehash of the OP and also can be restated symmetricly for over speeding as for underspeeding and thus adds nothing here.
It also fails to address my point about kinetic energy, which is proportional to the square of speed!
