V2X system able to locate vehicle in Norwegian tunnel testing
A successful trial of a vehicle positioning system in Norway has been conducted in the Bjørnegård tunnel in the municipality of Bærum by the Norwegian tunnel technology company Aventi in partnership with connected autonomous vehicle technology company Cohda Wireless. The purpose of the trial was to demonstrate the efficacy of Cohda Wireless’s vehicle positioning solution, V2X-Locate, in the newly-built 2.2 km (1.4 mi) tunnel.
V2X-Locate was developed by Cohda Wireless to solve the problem of accurate vehicle positioning where GNSS (GPS) systems usually perform poorly. Four of Cohda’s road-side units (RSUs) were positioned at intervals inside the tunnel, and following a range of tests, Cohda’s V2X-Locate solution was reportedly able to locate a vehicle moving through the tunnel with a high degree of accuracy.
Cohda says this trial paves the way for the introduction of reliable cooperative connected automated and automated mobility (CCAM) and cooperative intelligent transport system (C-ITS) technology services in tunnels, which make up 1400 km (870 mi) of Norway’s roads.
Bjørn Elnes, Systems Engineer at Aventi, said, “C-ITS currently relies on good GPS reception under open sky, but this test proves that we can make it work in tunnels as well. This was a fairly short tunnel, well suited as a proof-of-concept, but we hope we’ll get the opportunity to implement this in the really long tunnels, like the E39 RogFast which will be 27 km (17 mi) long, with complex exit ramps and two roundabouts in the middle. In addition to increasing safety and convenience for drivers currently using the tunnels, it will also enable autonomous shuttles to traverse these tunnels."
Cohda Wireless Chief Technical Officer Prof. Paul Alexander explained that the Bjørnegård tunnel is a road transport environment in which GPS and dead reckoning positioning can be off by up to 40 m (131 ft), and the challenges associated with this are usually demonstrated in relation to autonomous vehicles, but as this trial demonstrates, it will be essential for a successful roll-out of C-ITS in countries like Norway. “Being able to locate vehicles with a high degree of accuracy in a tunnel of these vast dimensions, without causing interference to other radio signals used in the tunnel, bodes well for the introduction of autonomous vehicles and buses,” said Alexander.