James Dalton, Association of British Insurers (ABI) head of motor insurance, said: "A car is potentially a lethal weapon."
He added that "radical action" is needed to "reduce the tragic waste of young lives on our roads, especially among the 17-24 age group".
An ABI spokesman told The Daily Telegraph: "Any restrictions to limit the number of passengers young newly qualified young drivers can carry for an initial period after passing their test would be a step in the right direction."
More top news
It will be a frosty start for many across the UK with slow-clearing mist and fog across parts of central and southeastern England.
The prime minister says she has proven the "doubters" wrong but still faces opposition from both sides of the Brexit line.
Defence saving plans raise "serious doubts" over the Ministry of Defence's ability to pay for new equipment, including warships and planes.