It's every cyclist's dream: no red lights, no trucks, just a clear, smooth lane to zoom down with the wind in your face. Welcome to Germany's first bicycle Autobahn.
Fans hail the smooth new velo routes as the answer to urban traffic jams and air pollution, and a way to safely get nine-to-fivers outdoors.
As a glimpse of a greener urban transport future, Germany has just opened the first 5km stretch of a bicycle highway that is set to span over 100km.
It will connect 10 western cities including Duisburg, Bochum and Hamm and four universities, running largely along disused railroad tracks in the crumbling Ruhr industrial region.
Almost 2 million people live within 2km of the route and will be able to use sections for their daily commutes, said Martin Toennes of regional development group RVR.
Aided by booming demand for electric bikes, which take the sting out of uphill sections, the new track should take 50,000 cars off the roads every day, an RVR study predicts.
The idea, pioneered in the Netherlands and Denmark, is gaining traction elsewhere in Germany too.
The banking centre of Frankfurt is planning a 30km path south to Darmstadt, the Bavarian capital of Munich is plotting a 15km route into its northern suburbs, and Nuremberg has launched a feasibility study into a track linking it with four cities.
In the capital, Berlin, the city administration in early December gave the green light to a feasibility study on connecting the city centre with the leafy southwestern suburb of Zehlendorf.
The new velo routes are a luxury upgrade from the ageing single-lane bike paths common in many German cities, where tree roots below can create irregular speed bumps and a mellow cycling lane can suddenly end or, more alarmingly, merge into a bus lane.
The new type of bike routes are around 4m wide, have overtaking lanes and usually cross roads via overpasses and underpasses. The paths are lit and cleared of snow in winter.
Like most infrastructure projects, the bicycle Autobahn is facing headwinds, however, especially when it comes to financing.
In Germany, the situation is complicated because while the federal Government generally builds and maintains motor-, rail- and waterways, cycling infrastructure is the responsibility of local authorities.
Toennes said talks were ongoing to rustle up 180 million ($287.6 million) for the entire 100km route, with the state government, run by centre-left Social Democrats and the Greens party, planning legislation to take the burden off municipalities.
The German Bicycle Club ADFC argues that, since about 10 per cent of trips in the country are now done by bicycle, cycling infrastructure should get at least 10 per cent of federal transport funding.
"Building highways in cities is a life-threatening recipe from the 1960s," said its manager Burkhard Stork.
"No one wants more cars in cities."