John Spence
John Spence - Mova specialist
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Transport assessments
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Transport assessments

Where the VA control strategy has been replaced by Mova, trials have shown significant benefits from use of Mova compared with best use of the traditional Vehicle Actuated control system.

Mova has been shown to offer reduced delays and increased capacity, especially at congested junctions, and reduced accident rates at high-speed sites.

Transport assessments

As regards performance, measured in terms of delay, the extent of improvement ranges from single percentage figures up to more than 20%, with an average of typically 13%. Larger benefits would be expected compared with VA which has not recently had its maximum greens and maxset timetable checked for suitability.

Because Mova responds dynamically to variations in arrival rates, there can be no analytical technique for predicting in advance the extent of the improvement at any particular site. Set up optimally, Mova will achieve an improvement in performance: the issue is ‘How Much?'

The issue for many Highway Authorities and developers arises in Transport Assessments, as follows. Mova is usually the cheapest and most effective way of providing an improvement to overcome the additional effects of development traffic, can be more effective than physical improvement of a junction, and land take is then not an issue. But whilst the impacts of a development proposal can be assessed, how does a Highway Authority or Developer know whether Mova is sufficient to overcome those impacts?