Officers believe there would have been a number of witnesses to the collision as it was a busy part of the day and are appealing for anyone with any information to get in touch.
Witnesses are asked to call officers at the Kent Police roads policing unit by calling 01622 798571, quoting incident reference 04-0559.
More top news
The family of a Sussex teenager who died after just one punch during a night out has reached a milestone in their lifesaving campaign.
The headteacher of a Berkshire secondary school has quit over funding cuts which she says means children will suffer.
Troops from the 4th Battalion the Rifles returned home today after spending four months on deployment in Iraq.