UNSETTLING footage shows the moment two cyclists crash head-on before flying off their bikes and hitting the tarmac.
One of the riders lands on her back on the surface of the cycle lane while another nearly falls in the road after the smash.
A third cyclist travelling behind the male rider also fell off as he tried to avoid the man's body on the ground.
The collision happened on a section of the East-West Cycle Superhighway between Tower Hill and Lancaster Gate in London.
The footage, which appears to have been captured on a helmet-mounted camera, shows the busy lane with cycles going fast in both directions.
A female cyclist is then seen overtaking the rider filming the journey before she swerves to avoid another bike in her path.
She then suffers a high-speed head-on smash with a cyclist coming towards her before they both come off their bikes.
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The woman, who has wearing a helmet, falls onto her back and rolls over as riders around her stop to help.
The other cyclist also bounces off the surface of the cycle path before his bike ends up in the road.
Fortunately no traffic was travelling down the road at the time.
Cyclists can be seen stopping to help the pair are the collision but the nature of their injuries is unclear.
The crash was filmed by YouTube user 4ChordsNoNet, who wrote beneath the video: "This section of CS3 (East/West Cycle Superhighway) is one of the narrowest, yet it doesn't stop some people from riding too fast and trying to overtake at busy times.
"This crash happened so quickly that I didn't really see what happened at the time, it was only when I sat down and looked at the footage that I saw that it was the overtaking cyclist that effectively caused it by going too fast and trying to overtake into oncoming cyclists.
"What was very worrying was that one of the cyclists travelling in the opposite direction ended up on the main carriageway.
"Fortunately for him the phasing of the lights meant that the traffic had been held back, otherwise we could have been talking serious or fatal injuries has a lorry or coach been coming along."
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