Vehicle type Rural freeways carry all types of vehicular traffic, with heavy trucks normally amounting to between 20% and 30% of the total volume. Connections ; Rural freeways connect with other freeways, arterials and collectors, through interchanges. A.5.5 Urban iocal roads Service function The function of loca! roads is to provide land access, and direct access is allowed to all abutting properties. Local roads are not intended to carry jarge volumes of traffic. The local road primarily carries traffic with an origin or destination along its length. it is not intended to carry through traffic other than to immediately ad- joining roads. Locai roads may be residential, or com- mercial and residential developments might carry ap- preciably higher traffic volumes and therefore may be muiti-lane, but are seldom divided. Traffic volumes Traffic volumes vary with the density of adjacent de- velopment and genarally do not exceed 3000 vehicies per day. Flow characteristics Local roads have interrupted traffic flow, and stop, yield or signalized controls where they intersect other roads and traffic flow is interrupted. Design speed . Design speeds are necessarily low, in the range of 30 km/h to 50 km/h. Table A.5b Characteristics of urban roads Running speed Running speed under free flow conditions is generally 20 km/h to 40 km/h. Vehicle tyoe The type of vehicle using local reads varies. Residen- tial roads carry predominantiy passenger vehicles and some industrial roads carry a high percentage of trucks. Bus operations on residential local roads are generally avoided. Connections Local roads connect to other local roads and collector roads. In some cases industrial or commercial local roads connect directly to arterials. A.5.6 Urban collector roads Service function Urban collector roads provide both traffic service and land service. The traffic service function of this type of roadis to carry traffic between local and arterial roads. ‘Full access to adjacent properties is generally allowed on collectors. Traffic volumes Traffic volumes range between 1000 and 12 000 vehi- cles per day. Collector roads might have more than two traffic lanes and might be divided. Flow characteristics The traffic flow on urban collector roads, in and near the ceritral business district, is interrupted frequently by signalized intersections. in residential areas, sim- pier forms of traffic control are generally used. There are few parking restrictions except during peak hours urban urban locals collectors urban urban arterials freeways service traffic function movement tratfic secondary movement consideration and fand access traffic optimum movement mobility ‘primary consideration land service traffic volume vehicies per day (typically) flow characteristics design speed, km/h average running speed, km/h (frae-fiow conditions) vehicle type nermai connections land access primary consideration <3000 interrupted flow 30 - 50 20 - 40 passenger & Service vehicles locals collectors of equal importance 1000 - 12 000 interrupted flow 50 - 80 30-70 all types land access secondary consideration 5000 - 30 060 uninterrupted flow except at signals and crosswalks 50 - 100 40 - 90 all types up to 20% trucks no access > 20 000 free-flow (grada separated) 80 -120 70 -100 ail types up to 20% trucks arterials freeways A14 ay January 1986