The Buckinghamshire Coroner will write to the Highways Agency to express his concern about the build-up of surface water on the M40.

Richard Hulett will send a note to the agency about drainage issues and the build-up for surface water on the motorway.

It follows an inquest into the deaths of Abdoulaye Mbaye and Mouhanadou Fall on July 18, 2014.

The pair were backseat passengers in a Peugeot which aquaplaned into the central reservation before it crashed into a BMW which had bounced across the motorway after it too lost control in the rain.

Mr Hulett was persuaded to send the letter by solicitors who expressed concerns about the build-up of surface water and the fact the M40 signs warning motorists of hazards were not used.

The Buckinghamshire Coroner said: “There’s certainly enough evidence here to say it is worrisome.”

Mr Mbaye and Mr Fall were two of five friends travelling back to Birmingham from a prayer meeting in Crawley.

The vehicle smashed into the central reservations before it collided with a BMW X5 at about 5.05am on July 18 last year.

Papa Dione, the driver of the Peugeot who was hospitalised, told the inquest that he remembered little about the tragedy other than it was raining and the BMW “came out of no-where”.

A statement from a witness to the aftermath of the crash, Peter Feathers, said he also aquaplaned on the stretch of road by the Wooburn Green Lane bridge between Beaconsfield and Loudwater.

Terry Anderson, collision investigator, told Beaconsfield Coroner’s Court there were four points of impact during the fatal incident.

The BMW aquaplaned into the central reservation before it bolted across all four lanes and smashed into the near-side barrier.

The driver walked away unscathed but, shortly afterwards, the Peugeot is believed to have skidded on the same wet surface in to the central barrier before hitting the BMW and ending up on its side.

Mr Anderson said there was water flowing across the carriageway from the hard shoulder.

He added: “The BMW driver lost control because his vehicle aquaplaned and the Peugeot also aquaplaned or it is possible the driver reacted to the crashed car up ahead.”

A post mortem revealed both men died from serious head injuries.

Mr Hulett recorded a conclusion of road traffic collision-related death before saying he would write to the Highways Agency for clarity on the matrix road signs and information on the drainage.