Drivers using A146 in the Lowestoft and Beccles area are being urged to check dashcam footage after a reported road rage incident.
Suffolk Police say a delivery van driver was targeted while travelling from Lowestoft towards Beccles, with the incident taking place between Barnby Bends and towrds Norwich.
Officers report that a Vauxhall Corsa repeatedly overtook and brake-checked the van over several miles, creating a potentially dangerous situation for other road users.
The incident happened in the evening and police are now appealing for anyone who witnessed what happened, or who may have captured it on dashcam, to come forward.
Anyone with information is asked to contact Suffolk Police quoting crime number 37/17659/26. Reports can also be made online, by email, or anonymously via Crimestoppers.
Police enquiries are ongoing.

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