The most common device for regulating, warning and guide drivers is called traffic signs.
It has following types:
1) Regulatory and Mandatory Signs
These signs impose the legal restrictions applicable at particular locations being usually unenforceable in the absence of such signs. The violation of these signs is a legal offence. The signs include Stop and Give-way signs; Prohibitory signs; No parking and No Stopping Signs; Speed Limit and Vehicle Control Signs, Restriction Ends Sign, Compulsory direction control and other signs.
2) Warning or Cautionary Signs
These signs are used to warn the road users of certain hazardous conditions that exit on or adjacent to the roadway. The warning signs include bends, dips, road, junctions, schools, level crossings, narrow bridges, U-Turns and cross roads etc. The signs such as “Road Under Repair” and “Speed Breaker Ahead” are also warning signs. These signs are painted on rectangular plates 40 cm, 45 cm. An equilateral plate of 45 cm sides is provided 15 cm above each of these signs. The bottom of the triangle is kept 2.75 m above the ground level.
3) Inflammatory or Guide Signs
these signs are used to guide the roads user along routes inform them of destination and distance and provide with information such as “End of Speed Limit”, “Parking Zone” etc.