GR36CL Vehicle Activated Radar Speed Sign - Multicolour LED and Data Recording

GR36CL Vehicle Activated Radar Speed Sign

The GR36CL Vehicle Activated Radar Speed Sign is a full-matrix multicolour LED speed display that uses radar detection and colour-coded visual feedback to influence driver behaviour at construction site entrances, local authority roads, school zones, and any location where speed reduction is a measurable safety requirement. The K-Band radar sensor detects approaching vehicles from up to 200 metres and triggers an immediate response: a green smiley face and speed display for compliant drivers, a yellow caution for borderline speeds, and a red frown with "SLOW DOWN" text for vehicles exceeding the threshold. All traffic events are recorded internally and accessed wirelessly via the STerminal 3 app or a browser-based dashboard, with no additional hardware required.

Why Choose the GR36CL Vehicle Activated Radar Speed Sign

• Multicolour feedback that changes behaviour: Single-colour amber signs show speed. The GR36CL shows speed and responds to it with green, yellow, and red colour coding plus smiley and frowning face symbols. Studies consistently show that emotional feedback combined with colour-coded responses produces a stronger and more sustained reduction in driver speed than numeric display alone.

• Integrated data recording as standard: Up to 1.6 million traffic records stored onboard. Speed distribution, volume, time of day, and trend analysis are all accessible without additional hardware or software licences via GRS Online browser analysis. This is included as standard on the GR36CL, not an optional extra.

• K-Band radar, CE approved, ±3% accuracy: The 24 GHz multi-target K-Band radar sensor detects vehicles from a minimum of 100 m and an average of 200 m, with trucks detectable from 300 m. Accuracy is ±3%, and the unit is CE approved. Speed range covers 3 to 255 km/h or 3 to 200 mph.

• IP67 protection for permanent outdoor use: The ASA plastics enclosure with Lexan anti-glare front window is rated IP67, meaning full protection against dust ingress and temporary water immersion. Operates in ambient temperatures from -25°C to 60°C, covering all UK seasonal conditions without additional weatherproofing.

• 4 kg for single-person installation: Weighing only 4 kg, the GR36CL can be mounted quickly by a single operative onto a lamp post, sign post, or dedicated pole using the supplied 60 mm pipe clamp. Repositioning between site locations requires no specialist equipment.

• Wireless configuration via STerminal 3: All settings including speed thresholds, display messages, colour triggers, and time controls are configured wirelessly via the STerminal 3 app on Android or iOS. No laptop or specialist software required on site. Remote data access is also available via cloud (4G) connectivity.

• Under 1W active power consumption: Display active power draw is less than 1W, making solar or battery operation practical for locations without mains supply. Compatible with solar, street lighting, mains power, and battery supply options.

What's Included

• GR36CL Vehicle Activated Radar Speed Sign

• STerminal 3 app (Android and iOS)

• GRS evaluation software

• Power cable 12V

• Pipe clamp 60mm

• Optional: variable pole clamps, batteries, solar power supply

 Specifications

Who Is This For?

The GR36CL Vehicle Activated Radar Speed Sign is used by construction site managers, traffic management contractors, local authority highway teams, facilities managers, and road safety officers who need a measurable, deployable speed reduction solution. It suits any location where driver speed poses a risk to pedestrians, site operatives, or road users, and where traffic data is needed to support safety reporting, planning applications, or enforcement requests.

Typical Applications

• Construction site entrance and haul road speed control where HGV and plant vehicle speeds must be managed

• Local authority residential road speed calming where data is required to support 20mph zone applications

• School zone and pedestrian crossing approaches where colour-coded feedback has the strongest behavioural effect

• Industrial estate and business park internal road speed management

• Temporary deployment at roadworks or event traffic management points

• Rural road speed awareness campaigns where data supports police or authority enforcement action

• Quarry, port, and airport internal road speed compliance monitoring

How to Use

1. Mount the sign onto a post, lamp post, or sign post using the supplied 60 mm pipe clamp. The 4 kg weight allows single-person installation without lifting equipment.

2. Connect the 12V power supply: mains, solar, battery, or street lighting tap depending on site conditions.

3. Download the STerminal 3 app on an Android or iOS device.

4. Connect to the sign via Bluetooth and configure speed thresholds, colour triggers, display messages, and time controls within the app.

5. Set speed threshold responses: green smiley and speed display for compliant speeds, yellow caution for borderline, red frown and "SLOW DOWN" text for excess speed.

6. Access recorded traffic data via the STerminal 3 app or GRS Online browser dashboard at any time. No additional software or hardware required.

7. Reposition the sign between locations as needed. The IP67 rating means no protective covers or additional weatherproofing are required during deployment or storage.

Safety

The GR36CL operates using a CE approved K-Band radar sensor transmitting at 5 mW. The unit is classified as a vehicle activated sign under UK road safety guidelines. It does not have enforcement powers and cannot be used to prosecute speeding motorists. Data collected by the unit can be provided to local authorities, police, and highway departments to support enforcement action and speed limit reviews. Installation on the public highway requires permission from the relevant highway authority. For private roads, construction sites, and internal estate roads, no highway authority approval is typically required. Always follow the manufacturer's installation guidance and local authority requirements for height, positioning, and sight lines.

Maintenance

The ASA plastics enclosure and Lexan front window require no routine maintenance beyond periodic cleaning with a damp cloth. The IP67 rating means no additional sealing or weatherproofing is required. Check the mounting bracket fixings periodically, particularly after high-wind events. The LED display uses Osram Black Series LEDs with a long rated lifespan and does not require scheduled replacement under normal operating conditions. If using solar or battery power, inspect the power supply connections and charge levels periodically according to the power supply manufacturer's guidance.

Frequently Asked Questions

Q: What is the difference between the GR36CL and the GR36L?

 A: The GR36L displays speed and symbols in amber only and does not include data recording. The GR36CL displays speed and symbols in multicolour (green, yellow, red) with colour-coded feedback based on speed thresholds, and includes integrated data recording of up to 1.6 million traffic records. The GR36CL also includes time control and GRS Online browser-based data evaluation. CMT stocks the GR36CL.

Q: Does the sign require planning permission or highway authority approval?

 A: On the public highway, installation requires permission from the relevant highway authority. On private roads, construction sites, quarries, industrial estates, and business parks, no highway authority approval is typically required. Always confirm with your local authority before installing on or adjacent to a public road.

Q: How is the sign configured and what speed thresholds can be set?

 A: All configuration is done wirelessly via the STerminal 3 app on Android or iOS. Speed thresholds, colour triggers, display messages, smiley and frowning face settings, and time controls are all set within the app over Bluetooth. No laptop or on-site software is required. Remote access is also available via cloud (4G) connectivity.

Q: What power supply options are available?

 A: The GR36CL operates at 12V DC and draws less than 1W when the display is active. It is compatible with solar panels, street lighting tap-off, mains power, and battery supply. Power supply accessories are available as optional extras. The low power consumption makes solar and battery operation practical for locations without mains supply.

Q: What does the IP67 rating mean for outdoor installation?

 A: IP67 is an international ingress protection standard. The first digit (6) means the enclosure is fully protected against dust. The second digit (7) means it can withstand temporary immersion in water up to 1 metre for up to 30 minutes. For a roadside device in UK conditions, IP67 means the sign can be installed permanently without additional weatherproofing and will operate reliably through rain, flooding, and temperature extremes from -25°C to 60°C.

Q: Can the data be used to prosecute speeding drivers?

A: No. The GR36CL is a vehicle activated sign and has no enforcement powers. Speed data cannot be used to prosecute individual drivers. However, the aggregated traffic data including speed distribution, volume, and time-of-day patterns can be provided to police, local authorities, and highway departments to support enforcement decisions, speed limit reviews, and 20mph zone applications.

Q: How far away can the radar detect approaching vehicles?

 A: The K-Band 24 GHz radar sensor detects vehicles from a minimum of 100 m, with an average detection range of 200 m. Trucks are detectable at an average of 300 m. The sign display is readable from approximately 150 m.

Q: How do I order and what are the delivery options?

 A: Order directly at cmt.co.uk. Most products are available on next working day delivery for orders placed by 7pm, with VIP dedicated delivery also available UK-wide on selected lines, dispatched within 30 minutes on a dedicated vehicle. Delivery availability is confirmed at checkout. Trade accounts, agreed pricing, and centralised procurement are managed through the EDGE portal, which includes role-based spending controls, live delivery tracking, and a full document hub for invoices and proof of deliveries. CMT Group operates a fleet of over 100 FORS Silver Accredited vehicles covering 90% of the UK mainland.

Vehicle Activated Signs: The Complete UK Guide