The unit measures every approaching vehicle and compares it with a car seen at the same spot. From this it derives an overall size index: G.
G = 1 for a car
A van or a small truck stays below 3; a large heavy truck or a bus exceeds 3.
Rule G > 3
The relay of the VIAprevent unit installed in the traffic-light cabinet, 300 metres away, is activated over 4G and/or LoRa. The rule applies only to the chosen lane: VIAprevent detects and tells the lanes apart.
The action
For each large heavy truck, the unit closes a relay for 5 s, on itself or on another unit by radio: for example to light a sign at the other end of the road and avoid trucks crossing. The video clip of the alert is sent by email.
Day and night
Without infrared lighting.
Real examples
Rule: G greater than 3 — 5 s relay on another unit, clip sent by email
