A cyclist awareness film with a quirky twist has garnered 10 million hits from viewers of YouTube, Transport for London (TfL) has said.
The minute-long film features two groups of people playing basketball and tests viewers' powers of observation.
The video has been shown in cinemas across London and has been on the video-sharing website since March.
A spokesman said the advert focuses on that fact that "it is easy to miss something you are not looking for".
TfL have launched another advert entitled Whodunnit with a murder mystery plot line.
The new advert has also been playing in cinemas and on YouTube since early November and has already received more than 52,000 hits.
The TfL spokesman said: "The ad encourages all road users to be more aware of each other while travelling - it aims to make drivers aware just how easy it can be to miss cyclists on the road and for cyclists to understand how difficult they can be to see."
Figures show the number of cyclists in London has risen dramatically since 2000, with an estimated 18,000 cyclists riding into central London everyday.
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