Glossary of terms used on this site

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Term Definition

Portable appliance testers

Pattern stations

Traffic count stations which continuously monitor or frequently sample traffic to determine patterns and seasonal fluctuations.  Such stations are permanent or semi-permanent for counting over a defined ‘season’ (usually a year).


Standard equivalent axle load

Piezoelectric cable

Mass sensor technology which incorporates a cable, usually mounted in an aluminium U shaped channel that is placed into the road surface.  The passage of a vehicle axle over the cable creates a wave form of current that is proportional to the axle mass.

PP sites

Permanent and pristine sites. High accuracy, corporate WIM sites across the network which provide the highest standard technically and telemetrically.  They also enjoy the highest standard of monitoring and upkeep.