As 23 cyclists streamed across a Punggol junction at night on Sep. 14, one crashed onto the road.
This caused another to crash into the first cyclist's fallen bike.
The accident was caught on video, which was then posted to the "SG Road Vigilante" Facebook group on Sep. 15.
GIF from SG Road Vigilante.
The fall
As seen in the video, a group of about two dozen cyclists were pedalling across a junction at the intersection of Punggol North Avenue and Punggol Way at night.
The video's caption indicated that this took place at 10:48pm. The footage was shot from a stationary car waiting at the red light.
Out of nowhere, a cyclist in black lost control of his bicycle and crashed to the ground, tumbling forward.
Immediately after, another cyclist in white rode into the first fallen rider's bike and was sent flying.
Both bikes were left in a heap next to each other.
As the two cyclists got to their feet, other cyclists continued streaming across the junction, although some slowed down to avoid crashing into the pair.
In total, 23 cyclists were seen making the crossing.
One cyclist in blue stopped to lend a hand to the pair, who were able to wheel their bikes away.
GIF from SG Road Vigilante / Facebook
Separate groups of cyclists
Responses to the video focused on the perils of riding in a large group.
One commenter suggested that they may have been separate groups of cyclists, as there was a gap between groups and the mishap may have happened due to a "lack of judgment", and not because of the large number of cyclists.
Others highlighted that such accidents could implicate other road users in close proximity to the cyclists if the riders fell on the road and were in the way of oncoming traffic.
In Singapore, it is an offence to cycle on roads in groups larger than five cyclists in a single file, or 10 cyclists riding two abreast.
Groups should also keep a minimum distance of 30m — or two lamp posts — between one another.
Cyclist hit a loose rock, resulting in crash
However, a man who said he was the unfortunate cyclist in the video contacted Mothership, and explained that the crash occurred because he hit a loose rock among some debris while crossing the road.
He did not see the rock and could not avoid it in time. The man, who wished to remain anonymous, said he did not overlap the wheel of the rider in front.
The crash, he said, was not due to a lack of distancing or poor judgement, but rather an unlucky accident.
He also confirmed that there was a separate group of cyclists behind his group, and it was not one big group of cyclists riding together.
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Top image from SG Road Vigilante/ Facebook