speedboard

plural speedboards

1. A board indicating a speed limit.

   Speedboards would provide drivers immediate notification of their speed as they pass the device.

   1989, Wisconsin Traffic Safety Reporter

   2 more examples

   Union Pacific has taken down Southern Pacific speedboards and replaced them with U.P. speedboards. U.P. speedboards for reduction of speed are posted at a measly 2,500 feet from the point of effect.

   1999, Locomotive Engineers Journal, volumes 106-108, page 4

   The panel also keeps the driver informed of current speed limits and target speed limits at speedboards and signals ahead.

   2009, John Impagliazzo, Timo Järvi, Petri Paju, History of Nordic Computing 2: Second IFIP WG 9.7 Conference, page 16

2. A skateboard designed for high speed.

   "We tend to get a bad rap because we are associated with the punk, vandal stereotype given to skateboarders," Pennell said. "The speedboard world is made up of people who love the sport too much to risk its reputation."

   2007 November 28, Nick Kolich, “Speedboarders fly down hills”, in The Beacon