The company is using volunteer employees to test out the CG-Lock device to test out its safety and posture benefits.

The CG-Lock system is a small palm-sized device that clips onto existing seatbelts to eliminate the slack in the lap belt, keeping the user in the safest possible position.

Graham Cox from CG-Lock explains how it works: 'As RoSPA highlights, the safest way to travel is to have no slack in the lapbelt portion of the seatbelt and have it running firmly across the hips. Without the CG-Lock this can only be achieved by repeatedly sitting upright and pulling the diagonal section of the seatbelt to remove the slack. Most people don’t do this and so the lapbelt "rides up" off the hips onto the stomach. This is not the position at which EuroNCAP tests are performed and significantly increases risk of injury should an accident occur. The CG-Lock keeps the lapbelt exactly where it should be, firmly across the pelvis.'

Tracey Scarr, fleet and road safety manager at Arval, added: 'Seatbelts are a really important area to look at because while there has been a lot of focus on child seats, adult restraints haven’t seen much development. There has been a significant amount of research into the problems associated with driver back pain and this is one area we want to try and help our drivers and customers address. The CG-Lock has been recommended by some top healthcare professionals to reduce back pain and has also been found to improve driver safety so we wanted to test it.

'Arval is conducting this trial because we are passionate about improving safety and comfort for fleet drivers but wouldn't recommend anything to our customers without testing it first.'

All of the Arval employees taking part in the trial are testing the CG-Lock for adult use, however some of them are also trialling the technology on child booster seats. The findings are expected in June.