A golf caddy was killed in a horror double collision after a British driver allegedly rear-ended the motorcycle she was riding.

Backseat rider Pornwalai Boonpok, 37, was travelling on a motorbike with her friend Arunwan Wannawong, 39, along Sukhumvit Road in the Sattahip district of Chonburi province, Thailand when British national Christopher Robert Rack, 64, reportedly crashed his white MG sedan into the bike's rear.

Dashcam footage shows how the car sped across the right lane on the tarmac and hit the two-wheeler, flinging the women onto the road.

Local police officers and medics arrived at the scene after receiving a report at 7:30 PM.

They found the grey Honda Scoopy motorbike damaged after the collision, with Arunwan suffering non-fatal injuries. She was sent to the hospital, but Pornwalai, who worked as a golf caddy, was pronounced dead after her head was crushed bn an oncoming Toyota Vigo pick-up truck driven by Sommai Klinpirom, 38.

Arunwan told police that the motorcycle was hit from behind by Christopher's car, causing them to fall.

Meanwhile, Sommai said: 'The crash sent the woman into my lane. It was so sudden I could not brake in time to stop the accident.'

Police Major Montien Gadudom of the Na Chom Thain police said both the British and Thai drivers will be questioned further to investigate the cause of the crash.

Thailand has one of the world's worst road safety records. Ministers have set the goal of reducing fatalities from 32.7 deaths per 100,000 people to 12 per 100,000 people by the year 2027.

However, a lack of road safety education in schools, cheap loans for cars, notoriously easy driving tests, police failures to enforce road laws as well as endemic corruption and chronic under-investment in infrastructure hamper the efforts.