Highway Engineering 2 min read
Major/minor priority intersections
Introduction A priority intersection occurs between two roads, one termed the ‘major’ road and the other the ‘minor’ road. The…
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Highway Engineering 5 min read
The Design of Highway Intersections
Introduction A highway intersection is required to control conflicting and merging streams of traffic so that delay is minimised. This…
Highway Engineering 3 min read
The ‘level of service’ approach
Introduction ‘Level of service’ describes in a qualitative way the operational conditions for traffic from the viewpoint of the road…
Highway Engineering 2 min read
Speed-density relationship
In a situation where only one car is travelling along a stretch of highway, densities (in vehicles per kilometre) will…
Highway Engineering 2 min read
Highway CBA worked example
Introduction It is proposed to upgrade an existing single carriageway road to a dual carriageway and to improve some of…
Highway Engineering 4 min read
Use of economic indicators to assess basic economic viability
Once the two parameters of project life and discount rate are set in place, these allow all costs and benefits…
Highway Engineering 4 min read
Economic life, residual value and the discount rate
A highway project is often complex and long term, with the costs and benefits associated with it occurring over a…
Highway Engineering 5 min read
Identifying all relevant costs and benefits
The application of cost-benefit for project assessment in the highway area is made more complicated by the wide array of…
Highway Engineering 4 min read
Cost-benefit analysis (CBA)
Introduction Within Europe, the method usually adopted for the economic evaluation of highway schemes, termed cost-benefit analysis, utilises the net…
Highway Engineering 5 min read
Scheme Appraisal for Highway Projects
Introduction Once a transportation plan has been finalised and the demand along each of its highway links has been established,…
Highway Engineering 3 min read
A full example of the four-stage transportation modelling process
Trip production Assume a study area is divided into seven zones (A, B, C, D, E, F, G) as indicated…
Highway Engineering 4 min read
Trip distribution
Introduction The previous model determined the number of trips produced by and attracted to each zone within the study area…