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LIMEKILNS JUNCTION WARNING SYSTEM, Limekilns, Scotland

Amey, 2016

Challenge

SWARCO Traffic Ltd was contacted by Amey to provide detection with advance warning of slow-moving traffic joining and crossing oncoming traffic on the A985 at Limekilns.

 

Specific requests were for a solution that was economical to procure and maintain with sustainable energy sourcing to ensure both directions of main traffic flow were provided a nuanced detection and activation solution for both crossing and stop-line stationary traffic.

 

Details

SWARCO was able to provide detection for the side junction stop line and the A985 central reservation right-turn zone utilising Flir Thermicam technology, allied to RF Solutions radio equipment in contact with two LED VAS displays.

All parts of the system are powered by solar panels supported by Rutland wind turbines linked to gel-acid power storage batteries to provide a sustainable power solution supported by a variety of weather conditions.

The use of a Flir 390 Thermicam with configurable detection software enabled the junction stop line and central reservation right-turn stop zone to be monitored simultaneously. The detection system is allied to a SWARCO controller providing VAS activation combinations where either one or both VAS are activated depending on the detected obstruction. The controller also allows display activation and deactivation timing delays to be incorporated, allowing moving traffic to flow through the section without automatically activating signs to ensure that drivers are warned of physical hazards rather than short through-pass activations causing unnecessary disruption.

Benefits

The use of VAS Display technology ensures that a sustainable power solution is achieved, while infrastructure disruption due to civils works and ongoing costs are minimised.

The use of a Flir Thermicam enables the system to detect vehicles in all conditions, including at night and in inclement weather, ensuring that approaching drivers get the best warning in the worst conditions. The combination of a Flir configurable interface with SWARCO controller ensures that detection is not reliant on ground loops, meaning that subsequent resurfacing of the carriageway can be undertaken with no effect to the detection and the detection zones can be amended in the future if required, again with no change to the physical equipment specification.

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