Safer Roads Unit. Wet Weather VAS at Friction Deficient Sites. Wet Weather VAS. Friction supply is rarely lower than demand in normal, dry conditions and as such advisory speeds set using friction supply would be expected to have poor compliance.
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Wet Weather VAS at Friction Deficient Sites
VAS units are discrete signs, which remain blank until activated by an approaching vehicle exceeding a preset speed limit, or `trigger speed‘.
Familiarity: Drivers will respond better to signs that are familiar to them. VAS can use established warning and regulatory diagrams from the MUTCD which are automatically recognisable to the motorist.
Safer Roads……. “Sooner rather than Later”