The effect of roadside development and obstructions on speed and placement of a vehicle on two lane roads is studied. Data was collected at 12 sites having obstructions of different types and at varying distances from the pavement edge. The mathematical equations relating maximum deflection of a vehicle to the distance of the obstruction from the pavement edge are developed. These relations indicate that a car is deflected from its normal path by 1.8 metres when a car is parked on the pavement edge. It is increased to 1.9 metres and 2.0 metres when the parked vehicle is a tractor and a truck respectively. The effect of an obstruction diminishes when it is at 10-12 metres from the pavement edge. Therefore, any developmental or commercial activity should be located at least this distance from the pavement edge. Further, data collected for speed and volume on two lane roads without encroachment and with encroachment on one side and with encroachments on both sides indicated that capacity of the road is reduced by 13.2 percent due to one side encroachment and 22.6 percent due to both side encroachments. (Author/publisher) For the covering entry of this conference, please see ITRD abstract no. E208431.
Samenvatting