Motor insurance is a "highly dysfunctional market" which has seen a drive for profits push up prices for consumers, a critical report from MPs has said.
They warned that "new forms of potentially dishonest practice" were emerging, including a new trend for ordering extra medical reports claiming psychological harm from road accidents.
A report called for more work to root out fraudulent claims, including a compulsory scheme to share data between insurers and solicitors.
It also said that lawyers should be banned for offering freebies such as cash or tablet computers to people considering making claims for car accidents.
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The families of all four of the victims, all of whom were men, have been informed, police said.
A motorcyclist from Nottingham has died in an accident at the Macau Grand Prix in China, earlier today.