A male cyclist sustained serious injuries and required hospital treatment after a collision with a 23-year-old driver on Glategny Esplanade.
Guernsey Police are appealing for information following the collision which occurred on 30 March outside the Co-op at 08:00.
The car being driven was a white BMW.
Enquiries are ongoing following the arrest.
Those with information or dashcam footage are asked to contact PC 85 De La Mare in the Roads Policing Unit on 222 222, or to contact Crimestoppers anonymously on 0800 555 111.
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