road safety feature by means of change in tyre noise
Rumble strip Rumble strips, also known as sleeper lines, alert strips, audible lines, sleepy bumps, wake up calls,[1] growlers, drift lines, and drunk bumps, are a road safety feature to alert inattentive drivers of potential danger, by causing a tactile vibration and audible rumbling transmitted through the wheels into the vehicle interior. A rumble strip is applied along the direction of travel following an edgeline or centerline, to alert drivers when they drift from their lane. Rumble strips may also be installed in a series across the direction of travel, to warn drivers of a stop or slowdown ahead, or of an approaching danger spot.
Toll roads in Great Britain It was not until 1654 that road rates were introduced. However, the improvements offered by paid labour were offset by the rise in the use of wheeled vehicles greatly increasing wear to the road surfaces. The government reaction to this was to use legislation to limit the use of wheeled vehicles and also to regulate their construction. A vain hope that wider rims would be less damaging briefly led to carts with sixteen inch wheels. They did not cause ruts but neither did they roll and flatten the road as was hoped.