ISBN Modern highway engineering reflects an integrated view of a road system's entire lifecycle, including any potential environmental impacts, and seeks to develop a sustainable infrastructure through careful planning and active management. This trend is not limited to developed nations, but is recognized across the globe. Edited by renowned authority T. Depending on the level of the highway relative to the surrounding terrain, side-slopes may also be a design issue.
The chosen carriageway depends on a number of factors, most notably the volume of traffic using the highway, the quality of service expected from the installation and the selected design speed. In most situations a lane width of 3. Any reduction or increase in these widths is considered a departure from standard. The stated lane widths should only be departed from in exceptional circumstances such as where cyclists need to be accommodated or where the number of lanes needs to be maximised for the amount of land available.
In Scotland and Northern Ireland, a total carriageway width of 6. Its main function is to make driving safer for the motorist by limiting locations where vehicles can turn right on dual carriageways , completely separating the traffic travelling in opposing directions and providing a space where vehicles can recover their position if for some reason they have unintentionally left the carriageway.
In urban settings, a width of 4. While these values should be the first option, a need to minimise land take might lead to reductions in their value.
Use of central reservation widths greater than the values stated is permitted. Its surfacing material should be different to that on the carriageway itself. Grass, concrete or bituminous material can be used. On single carriageway roads normal and wide , a 1m wide hardstrip and a 2.
On rural 2 and 3-lane motorways, a hard shoulder of 3. Handbook of Road Technology 4th Edition. Highway Engineering 3rd Edition. Highway Engineering Handbook. Roger L. Coleman A. Road Construction. Traffic and Highway Engineering. Disclaimer: Definecivil. The links are available on the internet and are being shared here as a resource only.
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