A tunnel incident warning system trial in Portugal, supported by Cohda Wireless’s V2X technology, has concluded successfully with results suggesting the ETSI ITS G5 short-range communication technology has reached a level of maturity sufficient to warrant widespread rollout.

The trial was part of the C-Roads Portugal (PT) initiative, comprising five C-ITS testbed Macro Pilot cases in the Atlantic Corridor in Portugal, as well as testbed of pilot cases, and aims to expedite the deployment of national scale C-ITS services.

Cohda Wireless supported C-ITS technology developer and systems integrator Allbesmart in a pilot project in the 1620m long Gardunha tunnel on Portugal’s A23 highway between cities of Castelo Branco and Fundão, testing the performance of V2X communication to deliver a tunnel incident warning service under real conditions. Globalvia, transport infrastructure operator leader, is the third partner of the project which manages the Gardunha tunnel and A23 Beira Interior highway. It is widely accepted that accidents in road tunnels are more dangerous than in the open air whilst hazardous substances are considerably more difficult to remove. When accidents occur in tunnels, smoke can cause poor visibility and the resulting decrease in oxygen can occur rapidly.

The implementation applied a Decentralized Environmental Notification Messages (DENM) service to alert vehicles to dangers, hazards and delays associated with tunnel access. The Gardunha tunnel is fitted with twenty surveillance cameras, air quality sensors, and fire and carbon monoxide sensors, all connected to a Traffic Control Centre in the village of Lardosa.

Cohda’s V2X technology, comprising six road-side units (RSUs) and ten on-board units (OBUs), facilitated the data exchange between infrastructure and vehicles based on the ITS G5 (IEEE 802.11p) protocol of the European Telecommunications Standards Institute (ETSI) on the 5.9GHz frequency.

Allbesmart CEO Jorge Ribeiro said that the trial proved conclusively that communication between RSUs and the OBUs was successfully delivered and that the pilot’s promising results could significantly reduce the risks associated with large tunnel infrastructure on Portuguese roads and highways.

“The trial proved our ability to deliver accurate and timely warning messages to drivers approaching the tunnel, even allowing them to exit the road at the next junction, if required,” explained Mr. Ribeiro.

Portugal road death figures are above the European average and authorities are committed to EU’s vision of Zero road fatalities by 2050.

Cohda CEO Dr. Paul Gray said that Cohda will remain involved in the next phase of the trial through the provision of its proprietary V2X-Locate technology.

“When GNSS connectivity is limited, such as in underground car-parks or tunnels, accurate vehicle positioning is almost impossible, as demonstrated in the Gardunha tunnel where location errors of up to three metres were demonstrated,” explained Dr. Gray.

“Only V2X-Locate can achieve sub-metre precision and we will support Allbesmart to deliver this.”
In early 2019, Cohda successful trialed V2X Locate in the 2.2km Bjørnegård tunnel in the municipality of Bærum, Norway.

Daniel Pinto da Silva, General Manager of the Globalvia Beira Interior Concession, reiterates Globalvia’s commitment in achieving absolute road safety and reaffirms high interest in proceeding with the development of applications based on Cohda’s technology.

Allbesmart include transitioning the pilot from C-ITS to a 3GPP V2X communication standard by deploying a pilot with 3GPP 5G V2X vehicular connectivity using the evaluation kit MK6 from Cohda Wireless (C-ROADS is based on ITS-G5 MK5). An interface for V2V sidelink communications will also be tested. The next steps will be done in the context of the P2020 5G-AUTO project (


Cohda Wireless is a global leader in the development of Connected Vehicles and Connected Autonomous Vehicle software with proven applications for Smart City, Mining and other environments. Cohda’s technology connects vehicles with infrastructure and pedestrians to make our streets, cities and working environments safer, smarter and greener. Cohda is headquartered in Australia and has offices in Europe, China and the USA.

Cohda Wireless’s innovative software solutions enable autonomous vehicles to connect with other vehicles and with Smart City infrastructure. These connections span Vehicle¬to¬Vehicle, Vehicle¬to¬Infrastructure, and Vehicle¬to-Pedestrian (collectively called V2X), and allow CAVs to ‘talk’ to each other, Smart Cities, and vulnerable road users in order to avoid accidents, reduce congestion and be more efficient. Cohda partners with Tier 1 Automotive Suppliers, ITS Equipment Vendors, and Mining Equipment Technology and Services (METS) vendors to provide complete hardware/software solutions to Car Makers, Smart Cities, and Mine Operators, respectively. Cohda’s products are used widely in locations including the USA, Europe, Australia, Japan, Africa, Middle East, China, Singapore and Korea.

All media enquiries can be directed to:

Grant Law

Grant Law Public Relations

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Allbesmart is an engineering company that provides outsourcing R&D services on V2X (Vehicle-to-everything) wireless communications, C-ITS technology integration, and pilots implementation (


Globalvia is a leading road and rail infrastructure manager, with operations in 6 countries, managing 21 roads and seven rail concessions. Strongly committed to innovation and sustainability, Globalvia develops technological solutions focused on user safety and quality of service. In Portugal, Globalvia ensures the operation, maintenance, and collection of tolls on the A4 Subconcession Transmontana and the A23 Concession of Beira Interior, with more than 300km of motorway (