Many of us are most likely to slow down, whether or not we're not speeding, when we see a police squad vehicle. That's just survival instinct, since law enforcement officers do monitor traffic speed with radar. The majority of people probably feel like the police are monitoring the cars around them at each turn. So why do lit signs work better than the threat of being pulled over by police?
One reason may be that the law enforcement may not be seen, while the signs are lit up and bright, making them easy to spot. Another reason could be that many people believe they probably won't get picked out by law enforcement for speeding if they're in a group going the same speed or even faster.
With a flashing sign that's giving info directly related to each driver, it might seem more likely that an individual might be ticketed for speeding. Whatever the explanations, traffic signs were assumed by a group of traffic experts and law enforcement to work better in a 2008 study.
Rumble strips are strips usually on the shoulder which make the auto vibrate when the tires roll over them. These could be a great option to bring someone's attention to where they are driving, to make them aware they are off the edge of the lane. Someone dozing off and curving to one side, for instance, may be woken by a strip's vibration. Somebody simply not paying attention and sliding to one side or the other could become mindful of the road, as well. As speed control, they were presumed far less effective than a driver feedback sign.
Speed bumps were another option. An ambulance or law enforcement automobile that has to rush to pick up somebody ill will be compelled to slow or discover a way around those bumps. Radar signs, though, don't affect the cars' movement in any fashion.
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