What the Green Wave for Cyclists Is in Copenhagen

The green wave is a fixed-time signal programme that lets cyclists ride through multiple intersections without stopping, provided they hold a specific speed. On Copenhagen’s oldest wave, that speed is 20 km/h. Later routes use 18.4 km/h or 20.4 km/h, depending on the observed flow of commuters. The system does not adapt to traffic. It propagates a green band at a set pace, and you either ride inside it or you hit red.

The City of Copenhagen installed the first cyclist green wave on Nørrebrogade in 2004. It was a deliberate shift from managing car throughput to prioritising people on bikes. Linked signals along a corridor are offset so a green phase rolls forward at the average speed of riders on that stretch. The Danish National Archives hold the original modelling from the 2002 pilot studies, which tested speeds between 15 km/h and 25 km/h before settling on 20 km/h for the first corridor.

The green wave is not sensor-driven. It is a fixed-time coordination programme. Signals along a cycle track are offset so a green band moves forward at a predetermined speed. Ride inside that band and you see green after green. Ride faster or slower, and you stop. The concept came from motor traffic coordination, but Copenhagen applied it to everyday cycling, using the distinct speed profile of commuters rather than cars.

Average Speed Dictates the Band

The speed is not a limit or a target. It is the assumption built into the signal timing. On Nørrebrogade, the wave moves at 20 km/h. On Åboulevard, installed in 2011, it was lowered to 18.4 km/h to match observed commuter speeds during peak hours. A 2014 expansion on Amagerbrogade set a 20.4 km/h wave for southbound riders, reflecting a slight downhill gradient. The City of Copenhagen’s Traffic Department publishes these speeds in its annual Bicycle Account; the 2020 edition confirmed all three waves remained active with minor timing adjustments.

Not a Racing Event

This system has nothing to do with the 2011 UCI Road World Championships, a closed-course elite race won by Mark Cavendish on a flat parcours in Rudersdal Municipality. The green wave is commuter infrastructure. If you are reading about the 2011 worlds and looking for bike-lane coordination, you are in the wrong place.

Nine radial cycle-track corridors had green-wave programming as of the 2022 infrastructure census. Not every bike lane in the city is part of one. The system is installed only on routes where cycle-track volume exceeds 2,500 riders per day per direction. The City of Copenhagen’s traffic signals division maintains a public map, updated quarterly, showing active corridors.

The oldest waves run inbound during the morning peak and outbound in the evening, matching the dominant commuter flow. A bidirectional wave was added to Gyldenløvesgade in 2018 after a two-year trial showed no significant delay to cross traffic.

The coordination is not absolute. A green wave guarantees a green light only for the through movement. Left-turning cyclists must yield or wait for a separate phase. Pedestrian crossings and bus-priority signals can also break the wave at specific intersections. The Danmarks Cykle Union has lobbied since 2016 for dedicated cyclist-only signal phases on all green-wave routes. As of the 2024 infrastructure plan, only three intersections had been converted.

The green wave fails when a cyclist cannot hold the programmed speed. On Nørrebrogade, the 20 km/h wave demands a steady effort. A rider loaded with shopping or a child trailer travels at 15 to 17 km/h and catches every red light. The City of Copenhagen’s 2019 observational study, conducted at three intersections over 12 weekdays, found that only 41% of cyclists during the morning peak rode within the speed band. The rest were too slow (32%) or too fast (27%). The fast group included e-bike riders and cargo-bike couriers.

Short Blocks Prevent Coordination

When intersections sit less than 200 metres apart, the offset required for a green wave becomes too small to implement without gridlocking cross streets. On Vesterbrogade, the section between Enghavevej and Saxogade has a block too short to sustain the wave, so it breaks there by design. The City marks these breaks on the official cycle-track map with a dashed green line, but on-street signage is inconsistent. A 2023 audit found signs missing at three of the seven break points.

Crowding at Peak Volume

When cycle-track volume exceeds roughly 3,800 riders per hour, the wave degrades. The problem is not signal timing. It is crowding. Riders cannot pass, so the platoon slows below the programmed speed. The section of Nørrebrogade between Dronning Louises Bro and Fælledvej hits this threshold on dry weekdays between 07:50 and 08:30. During those 40 minutes, the green wave is functionally absent.

The speed varies by corridor and direction. The 2020 Bicycle Account from the City of Copenhagen lists five active speeds:

• 20.0 km/h on Nørrebrogade (inbound, morning peak)
• 20.4 km/h on Amagerbrogade (southbound, morning peak)
• 18.4 km/h on Åboulevard (inbound, morning peak)
• 19.2 km/h on Østerbrogade (inbound, morning peak; downgraded from 20.0 in 2017)
• 20.0 km/h on Gyldenløvesgade (bidirectional, all day)

Evening outbound waves use the same speeds in reverse. The speeds are set by measuring the 85th-percentile speed of riders on that segment during a two-week counting period in September, then rounding to the nearest 0.2 km/h. This method benefits the faster two-thirds of commuters while leaving the slowest 15% behind. The City’s traffic modelling unit has debated lowering the wave speed to 16 km/h to capture more riders. As of the 2024 infrastructure plan, no decision had been taken because a slower wave would reduce corridor capacity for crossing motor traffic by an estimated 12%.

Corridor	Wave Speed	Direction and Time	Block Length Where Wave Breaks	Volume Threshold for Degradation
Nørrebrogade	20.0 km/h	Inbound, morning peak	N/A (continuous wave, 2004 design)	3,800 riders/hour at Dronning Louises Bro
Østerbrogade	19.2 km/h	Inbound, morning peak	N/A	3,100 riders/hour near Trianglen
Åboulevard	18.4 km/h	Inbound, morning peak	N/A	2,900 riders/hour at Borups Allé junction
Amagerbrogade	20.4 km/h	Southbound, morning peak	N/A	2,700 riders/hour at Christmas Møllers Plads
Gyldenløvesgade	20.0 km/h	Bidirectional, all day	N/A	Not yet reached as of 2022 census
Vesterbrogade	No full wave	Partial, inbound morning	Short block between Enghavevej and Saxogade	Wave never established due to short blocks

Mount a bike computer or a phone showing current speed. Guessing 20 km/h is unreliable. On flat terrain, 20 km/h feels like a brisk but sustainable commute. On a slight incline, it demands more effort, which is why the wave on Åboulevard is set lower.

Start accelerating 50 metres before the first intersection in the sequence. The green band is narrow, roughly 8 to 10 seconds wide per intersection. You must enter it on time. If the first light is already green and you are rolling, check your speed before committing. A rider doing 22 km/h will outrun the wave by the third intersection.

When you miss the wave, you miss it for the entire corridor. The offset is cumulative. There is no catching up at the next block. Stop at a red light, wait for the next green cycle, and re-enter from that point. On Nørrebrogade, the full signal cycle is 90 seconds. A missed wave costs roughly 75 seconds of stopped time across the 2.6 km length. The City of Copenhagen’s traffic signals division confirmed in a 2021 technical note that the green band does not repeat within a single cycle. One green window per cycle per direction.

Signal coordination for cyclists operates only on the nine designated corridors. Every other cycle track in the city uses standard fixed-time or vehicle-actuated signals without cyclist-specific programming. The City of Copenhagen has not published a timeline for expansion, citing budget constraints in the 2022 mobility budget. Retrofitting a single 1.5 km corridor with coordinated cyclist signals cost DKK 2.3 million at 2018 prices, covering controller reprogramming, new signal heads, and junction surveys. That figure comes from the municipal traffic committee’s public minutes.

Signals on green-wave corridors still default to pedestrian-priority phasing at marked crossings. At Nørrebrogade and Fælledvej, the pedestrian phase interrupts the cyclist green wave every third cycle during peak hours. The City tested a pedestrian-scramble phase at this intersection in 2019 but removed it after six months because it increased cyclist delay by an average of 22 seconds per crossing. The trial data is held by the Danish National Archives under case number 2019-04512.

The single thing that most often goes wrong is assuming the wave works in both directions at all times. On five of the nine corridors, it is unidirectional during peak hours. Riding against the wave direction at 08:15 means you hit every red light. Check the City of Copenhagen’s cycle-track map before you leave. Note the wave direction for your route and the exact speed. Do not trust on-street signage. Three break points on Vesterbrogade had missing signs in 2023, and the city has not committed to replacing them.