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Coeval’s Overheight Vehicle Detection (OVD) System is designed to tackle the problem of bridge strikes at its root, with the power of intelligent technology. With a height tracking sensor, the system responds to the approach of an overheight vehicle, alerting the driver via an LED warning sign and diverting or stopping them before any damage can be caused.

With this simple measure, Coeval’s OVD System directly addresses the issue of drivers not knowing the height of their vehicle. As well as the clear benefits of their responsive nature, the signs are robust, vandal resistant and visible in all conditions – an especially crucial benefit in the Winter, where driver visibility can be a challenge. The sign technology is fully customised so the message is bespoke to its location, providing specific instructions to the driver. These signs have been shown to reduce bridge strikes wherever they have been implemented.




Wireless and GSM options reduce installation costs, and operators benefit from the remote user interface and text message alerts. Clear Hi-intensity display, perfectly visible in all conditions.

Suitable for all road speeds and locations, with vandal resistant face protected LEDs and performance assured.

Key Features

  • Wireless and GSM options available
  • Robust and purpose built
  • LED warning signs type approved to TR2516/BS EN 12966
  • Signs utilise one-piece face construction
  • Full range of character sizes available


  • TOPAS Specifications: TOPAS 2515A – OVD
  • Working Range: Up to 35 metres (50 metres optional)
  • Height Accuracy: +/- 1mm in still air
  • Message Duration: 1 to 99 seconds
  • Delay before sign activation: 0 to 15 seconds
  • Controller Size: 460mm x 315mm x 160mm
  • Weak Signal Tolerance: Up to 80% signal loss tolerant
  • Sign Case Construction: Maintenance free, powder coated aluminium
  • Wireless Radio Link: Licence-free, ETSI EN 300-200 compliant
  • Options: SMS Alerting Service
  • Housing: IP66 Enclosure


Enquire today about Overheight Vehicle Detection.


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    What our clients say

    Connect Plus Services M25 Dartford Crossing

    ‘Even a short closure of the tunnel causes great congestion in the area, and if an over height vehicle were to cause that level of damage, the tunnel could be closed for hours, if not days, which would bring the whole of the South East of England to a standstill.

    When the Coeval over height vehicle detectors were first installed, we were talking about 10’s of vehicles a day that we were stopping; we are now down to low single figures, 4 or 5 vehicles a day we need to extract for being over height, so it’s a great improvement in efficiency through the crossing.’

    Platinum Electrical Ltd

    ‘Having used Coeval for the first time, we found them to be friendly and really helpful in ensuring we received the correct item we required. We were happy with the extremely quick response times and professional service they offer. We would definitely recommend their services to others.’

    Gloucestershire Airport

    ‘Thank you for your prompt and efficient service regarding our request for training on the 21st of August. You guys have been incredibly helpful over this.’

    City of Edinburgh Council

    ‘Coeval won the tender for the replacement overheight vehicle detector systems. The work was completed within programme and budget. We are now satisfied that the new systems will help protect the bridges for several years to come.’

    Swindon Borough Council

    ‘A sound, honest and efficient service provided by Coeval. Would be very happy for Coeval to manufacture and supply more of Swindon’s signs.’