Croix-Rousse demonstrates art of tunnel safety

How do you expand a tunnel when it has reached its traffic limit? Build another tunnel in parallel to it. That, at least, is what Lyon did and opened the 1.7km Croix-Rousse dual-tunnel system in 2013. The smaller, new €283 million tunnel has become a symbol of Lyon’s intention to reinvent itself as one of France’s most innovative mobility centres, said Mathieu Hermen, head of operations at La Metropole de Lyon. Construction of the original two-lane tunnel under one of the city’s most densely populated arro
December 6, 2018 Read time: 3 mins
Eco-tunnel: the Croix-Rousse in Lyon
How do you expand a tunnel when it has reached its traffic limit? Build another tunnel in parallel to it. That, at least, is what Lyon did and opened the 1.7km Croix-Rousse dual-tunnel system in 2013. The smaller, new €283 million tunnel has become a symbol of Lyon’s intention to reinvent itself as one of France’s most innovative mobility centres, said Mathieu Hermen, head of operations at La Metropole de Lyon.


Construction of the original two-lane tunnel under one of the city’s most densely populated arrondissements started in 1939. Work was halted by the Second World War when the site was used as an air-raid shelter. It was finally opened in 1952. The original tunnel has a speed limit of 50kph and nearly 50,000 vehicles use it daily.

Physical separation


A concrete barrier was installed in 1998 to physically separate the two lanes, both of which have a useable width of almost 6m. But physical deterioration by then was starting to be a concern, as well as a lack of escape tunnels, which meant something had to be done.

Much consultation ensued to consider options such as double-decking the original tunnel and widening it. But the chosen option was to make a parallel tunnel and use it for more eco-friendly modes of mobility.

The single vehicle lane is for public transportation – buses – and there is a separate two-way cycle path as well as a wide separate pedestrian path. Thanks to 11 cross-galleries the latest 10m-wide tunnel acts as the escape tunnel for the original vehicle tunnel, explained Hermen. Around 2,300 cyclists and 2,000 pedestrians use the new tunnel each day.

The busway – a one-way direction - can be later adapted for use by a tramway should the city decide to go down that route. Only one bus at a time is allowed through the tunnel in case of a breakdown that could snarl up other buses behind the stricken vehicle.

Emergency escape


A barrier, almost 1m high, separates the busway from the cycle lane. But there are many sections of the barrier that will slide open in the case of an emergency, should people need to escape the tunnel. The escape cross-galleries are sealed by heavy doors that are motorised for ease of opening from inside. There are also digital temperature readouts inside the galleries so occupants know, in the case of a fire, what the temperature is right behind the door. A main control centre for all motorways and the tunnels in Lyon lies some way away, but there is a small operations control centre at one end of the new Croix-Rousse for monitoring an emergency situation on-site.

During a technical tour of the Croix-Rousse ‘eco-tunnel’, delegates experienced the three-dimensional video show that covers much of the infrastructure’s walls. The artistry and imagination has turned a city commuter’s daily experience into a must-visit for many tourists to Lyon.

Related Content

  • Kerb your enthusiasm, warns Passport
    March 4, 2019
    Dynamic kerbside management is crucial if urban authorities are to address increasingly chaotic situations caused by the gig economy and mobility innovation, says Adam Warnes at Passport Demand for the kerbside is growing and changing and it’s no surprise when you consider the recent innovations within the mobility industry. For starters, there are new modes of transport, including ride-shares, electric vehicles (EVs), dockless cycles, last-mile consolidations and autonomous vehicles (AVs). Secondly, the
    Read More
  • Transport in the round
    October 13, 2015
    The ITF’s Mary Crass tells Colin Sowman why future transport demands will require governments to overcome the silo effect of individual single-modal authorities. The only global multimodal transport policy organisation,” is how Mary Crass describes the International Transport Forum (ITF), which is housed at the Organisation for Economic Cooperation and Development (OECD). As head of policy and summit preparation at the ITF she says: “All other organisations are either regional or have a modal focus, we cove
    Read More
  • Pedestrian and cycle counters installed across Aberdeen
    October 25, 2016
    Pedestrian and cycle counters have been installed around Aberdeen, Scotland to accurately monitor numbers of people using pavements and cycleways. The equipment, from UK company Traffic Technology, includes 13 Eco Multi counters which have been installed beside strategic pavements, which include off-road paths, dual-use pavements and segregated routes and are on paths which connect residential areas to schools, employment areas, parks and riversides. Some of the counters, which distinguish between ped
    Read More
  • Vancouver to replace tunnel with toll bridge
    September 30, 2013
    In an effort to reduce "the worst bottleneck" to traffic in the region, Vancouver, British Columbia, is to replace the Massey Tunnel on highway 99 with a wider bridge that is expected to be a tolled. The four-lane lane tunnel, which opened in 1959, is heavily overloaded for much of the day, carrying an average daily traffic of around 80,000 vehicles. Public consultation favoured a new bridge over the alternatives of renovation and additional tubes.
    Read More

Highlighted Content