Some of the drivers involved in the Sheppey Crossing crash have been asked to take part in a safety awareness course – or face prosecution.

Kent Police will not reveal how many people have been summoned to attend, but several motorists are thought to have received letters.

More than 130 vehicles were involved in the huge crash on the bridge, which happened during thick fog on Thursday, September 5.

It was described as one of Britain's largest-ever crashes and around 40 people were taken to hospital, but no one died.

The letter has been sent to some of the drivers by Kent Police's traffic summons team.

It says officers believe there is enough evidence to prosecute the addressee for either driving without due care and attention or without reasonable consideration for other road users.

But it says they believe it would be beneficial if they take part in a National Driver Alertness Course as an alternative as it will make them a safer motorist.

If they accept a place, they will have to fork out £165, which covers the costs of administration for participating.

The day-long course consists of "interactive classroom elements" as well as practical elements of driving under the supervision of a qualified instructor.

There is no pass or fail, but if the course is completed successfully it means the participant will not incur any penalty points or fines.

One driver who received a letter said: "I find this unfair as not everyone in the accident was driving dangerously.

"Due to the conditions I did everything within my power to avoid any collision with any other drivers.

"In no way was I driving dangerously or endangering other drivers."

A Kent Police spokesman was unable to release the number of people who have been written to because the investigation is still on-going.

However, it is nearing completion and it is anticipated details will be released early this year.