In most developed countries the road is very important for safety driving. A well designed road can help drivers save their lives. However the construction cost of high standard roads is very expensive that many countries could not afford
The high standard roads have “ Tone Bands “ impressed on the edges of the legal lanes, so that drown sing drivers are awakened by a loud hum while they are releasing the steering and drifting off the edge of the roads. Tone bands are also referred to as “ Rumble Strips. ” Depending on the sound they created. An alternative method is the use of “ Raised Rib ” markings, which consists of a continuous line marking with ribs across the line at regular intervals. They were first authorized for use on freeways or motorways as an edge line marking to separate the edge of main lanes.
The objective of the marking is to make the roadsides be seen clearly by motorists in both day and night times. It also provides an audible vibratory warning to motorists that their cars are swerving off roads. When these standards are used in building roads, they can help reduce accidents on motorways. Truck driver have confidence in using the motorways with these standards.