Types of roads

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a slideshow about types of roads and their classification for transportation engineering course.

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Types of roads

  1. 1. Types of roads Khaled Al shami
  2. 2. introduction Roads can be classified in many ways. The most common classification is based on speed and accessibility. The classification standards differ from a country to another. This presentation will be based on Australian classification.
  3. 3. Free ways or express ways A free way is a highway with separated lanes, traffic doesn’t stop in free ways. Interchanges (ramps) are used to enter and exit freeways. Freeways have strict classification rules : • • • • • • • • • Multi-Lane, divided road. No cross traffic. No stop lights or stop signs. No parking. Highest speed limits, with a minimum speed limits sometimes. Limited access Access restrictions like : -No pedestrians -No bicycles Entrance ramps are typically designed with an acceleration zone so that cars can accelerate up to freeway speeds before merging into freeway traffic. Exit ramps are typically designed with a deceleration zone so that traffic can exit the freeway at freeway speeds without obstructing traffic, then have sufficient distance to slow down before any turns.
  4. 4. Major Highway • • • • • • • • High speeds almost like freeway speeds. Divided lanes. Turning traffic is typically limited to specified turn lanes or freeway style ramps to minimize obstructions to thru traffic. Partially limited access with few minor streets intersecting with this road. Can have stoplights or freeway style interchanges. No stop signs. Pedestrian crossings may be limited. Local business access is often restricted to frontage roads or other streets.
  5. 5. Minor Highway • A high way that is between residential areas, Or in rural areas. • Can have divided or not divided lanes. • Can have stop lights.
  6. 6. Arterials • • • • • It is a general term denoting a street primarily meant for through traffic usually on a continuous route. They are generally divided highways with fully or partially controlled access. Parking, loading and unloading activities are usually restricted and regulated. Pedestrians are allowed to cross only at intersections/designated pedestrian crossings. arterial road is to deliver traffic from collector roads to freeways or expressways, and between urban centres at the highest level of service possible. As such, many arteries are limited-access roads, or feature restrictions on private access. serve to carry longer-distance flows between important centers of activity. They are often hazardous to people on foot.
  7. 7. collector road or distributor road • These are streets intended for collecting and distributing traffic to and from local streets. • also it provides access to arterial streets. • Normally full access is provided on these streets . • Speed limits are typically 30-55 km/h.
  8. 8. Local streets • Its streets that gain access to properties around it. • Its designed for low volume traffic an small capacity. • It has full access and slow speeds.
  9. 9. Local street Collector street Arterial street Freeway highway expressway
  10. 10. freeway highway expressway arterial collector local Trip lenght long long long Long to moderate Less than ½ mile Less than ¼ mile Traffic volume high high high High to moderate Moderate to light Light 7500-20000 minor arterial 1500-2500 for neighbourhood collector <1500 vehicle >20000 major arterial 2500-7500 major collector Access control full High to moderate High to moderate High to low low none Lane division Divided lanes Divided or not Divided lanes Divided or not Divided or not Not divided Pedestrian crossing N/A available N/A available available available Stop lights N/A possible possible possible available possible Stop signs N/A possible N/A possible possible possible Speed limit High speed High to moderate speed High to moderate speed High to moderate speed Moderate to low low
  11. 11. Mobility vs Accessibility :
  12. 12. Thank you for your time

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