Rumble strips are traffic-technical calming devices, that provides both an audible warning and physical vibration to alert motorists , as the vehicle tires traverse the rumble strips, to reduce speed, to harmonize ride with prescribed speed limit.
As a rule, rumble strips are placed along the carriageway in front of schools, nursery schools, railway crossings, pedestrian crossings, toll roads passes, crossings and dangerous bends, at the places where speeds are high and where warning with strong vibrations and sounds effects is used to reduce speed on prescribed speed.
Rumble strips can be made of granular igneous rocks or transverse strips, which are made of some other materials (plastic or rubber) and they are placed along the entire width of the road, their width is 20-40 cm and their height is 18-25 mm.
Rumble strips are placed in pairs at a distance of 1.8 m (2.0 m), if it is necessary they can be repeated several times (variant 1). Their distance depends on speed of vehicle’s arrival and amounts to:
Rumble strips can be placed as strips across the entire width of roadway, width 9-12 cm and height 18-25mm.
Rumble strips can be placed in sets from 5,6 and 7 strips (variant 2). Distance between sets can be 15 or 30 m, depends on a place of placement (in settled area or out of settled area). When it comes to settled area, in the first set distance between strips is 45-60 cm, in the second set is 30-45cm and in the third is 25-35 cm. When it comes to out of settled area , in the first set distance between strips is 60-80 cm, in the second set is 45-60 cm and in the third is 30-40 cm.
Justification of the use, impact on traffic environment, zone’s length, traffic-technical conditions, workmanship materials, marking and other technical conditions and parameters related to use and placement of rumble strips are defined in project-technical documentation.