(Speed Bump/Dave Coverly)Don't be that guy. Your freshly washed, waxed, and buffed palomino is pretty. The new rims sparkle like stars. You don't want it dinged when someone else climbs off his horse. Still: you get only...

Mexican firm Decano Industries has developed a speed bump that remains in place when a vehicle that is moving too quickly is about to drive over it, but retracts when a slow-moving vehicle approaches. Christ Hawley writ...