Vibration Effect Produced by Raised Pavement Markers on the Exit Ramp of an Expressway

Table 1

Spacing for the radius of a circular curve.

Design speed km·h^−1	20~30	30~40	40~60	60~80	80~100	100~120
General value of minimum radius of circular curve m	30~65	65~100	100~200	200~400	400~700	>700
Spacing m	2.25~3	3.5~4.5	4.5~7	7~11	11~15	15