Handlebar-mounted sonar checks for close overtakes - BikeBiz

Handlebar-mounted sonar checks for close overtakes

US company creates handlebar-mounted sonar.
Publish date:

Measuring the distance a motorist gives a cyclist when overtaking is usually done by "eye" or by estimating distance from video recordings, both of which can suffer from inaccuracies. Now an American company has created a handlebar sonar unit. 

The C3FT was designed by Austin-based engineering firm Codaxus for a US police force in a State with a "3 foot passing law". However, the unit could be used by academics, local authorities and police forces worldwide. Video-equipped cyclists now reguarly post footage of close overtakes but the cameras favoured by "helmetcam" cyclists often give distorted wide-angle views.

Image placeholder title

The unit uses an ultrasonic detector to monitor overtaking distances and transmits this information on a numeric display. Buzzers and LED indicators are set off when a motor vehicle crosses the preset distance threshold. With a Go-Pro on the handlebars, pointed at the display and at the overtaking vehicle it would be possible to record incriminating information. In the US, 26 states have "3 ft" laws, although they have so far been tough to police.

Rule 163 of the UK Highway Code states that motorists should give as much room to cyclists as they would give when overtaking another car. This is illustrated with the motorist taking a position in the opposite carriageway, a manoeuvre demonstrated by a "how to" video produced by the Bicycle Association and British Cycling, and starring Chris Boardman.

Featured Jobs

the cycle hub

Showroom Manager

The Cycle Hub I Dubai, United Arab Emirates I Competitive Package & Bonus I Date Published Tuesday 26th June 2018

Giant St Paul Logo

Bike Fitter / Sales Person

Giant St Pauls I City of London I Salary: Negotiable Dependent on Experience I Date Published Thursday 21st June 2018


Bike Technician

Chain Reaction Cycles I Ballyclare I Competitive Salary & Benefits Package I Date Published Monday 2nd July 2018


Brand Content Writer

Canyon Bicycles GmbH I Koblenz, Germany I Salary: Up to €38,000 I Date Published Tuesday 3rd July 2018


Retail Sales Advisor

Chain Reaction Cycles I Belfast I Competitive Salary & Benefits Package I Date Published Monday 2nd July 2018