Chapter 3: Local Road Planning 91 On the other hand, the capacity of a road in an hour is influenced by the following factors that are present along the same road: a. Number of lanes; b. Carriageway or lane width; c. Shoulder width; d. Gradients and their length; e. Truck and bus percentage of total traffic; f. Lateral obstructions on both or one side of the roadway; and g. Roadside friction The degree of roadside friction has an impact on the capacity of a road. These roadside frictions are described as follows: a. None. Few or no buildings along the roadside; b. Light. Buildings and/or road intersections along and close to the road, 100 -200 meters between these objects, pedestrians and non-motorized traffic observed occasionally; c. Medium. Scattered roadside development, 50-100 meters between buildings and/or road intersections, pedestrians and non-motorized traffic observed frequently; and d. Heavy. Continuous roadside development with less than 50 meters between buildings and/or road intersections, pedestrians and non-motorized traffic tend to disrupt the motor vehicle traffic and reduce travel speed to below 35 km/hr. even at low traffic volume. The Basic Hourly Capacity of a road is given in Table 3.10, which is adopted from the DPWH Highway Planning Manual.