The two men, aged 25 and 54, were fatally injured when they were struck by a silver Mercedes on the London-bound A20 near Swanley in Kent at around 11am on Tuesday.
They had gone to assist the driver of an overturned silver Vauxhall Astra.
A total of seven vehicles were involved in the incident and a further six people were injured.
The road was closed for 12 hours as officers from the Kent Police Serious Collision Investigation Unit examined the area.
Officers are appealing for anyone who may have witnessed the incident or has any dashcam footage that could help with enquiries.
:: Anyone with information should contact the unit witness appeal line on 01622 798538 or email [email protected]
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