Overtaking Sight Distance (OSD)
d2 = Distance traveled by the vehicle A from A2 to A3 during the actual overtaking operation in time T sec. where S = Minimum spacing between two vehicles. s = 0.2Vb+6 here Vb is in km/hr.
What are the factors on which overtaking sight distance depends?
The minimum overtaking sight distance depends upon the following factors:
- Speed of the overtaking, overtaken and the vehicle coming from the opposite direction.
- Rate of acceleration of the overtaking vehicle.
- Spacing between the vehicle.
- Skill and reaction time of the driver.
How the length of overtaking zone is decided?
Particular zones marked with the wide roads for overtaking operation in the highway when it is not possible to provide overtaking sight distance (OSD) throughout the length. Minimum length of overtaking zone = 3 × OSD. Desirable length of overtaking zone = 5 × OSD.
