A car nosedived from a bridge in a horror crash that killed two people including a 97-year-old great grandfather in Thailand.

The white Isuzu Mu-X was travelling along the Thanarat Bridge when it collided with a Nissan 350Z and plunged into the Mae Klong River in Ratchaburi province, Thailand, on February 25.

Police Major Nattapong Ardaum of the Muang Ratchaburi Police Station said officers were notified of the accident at 5:40 pm local time.

They arrived at the scene, where the damaged Nissan 350Z driven by local bonsai expert Sittisak was blocking the road. A section of the bridge railing was also destroyed in the crash.

Two injured survivors, the driver and a former district council chief in Pattani province, Supol, 69, and a female passenger Warawan, 57, were rescued.

However, Supol's wife Kruewan, 65, and father Pin, 97, were both killed in the crash.

The crash occurred after Supol allegedly tried to overtake Sittisak's sports car.

Furious Nissan owner Sittisak said: 'This action could be seen as intentional murder because I had no prior acquaintance or disputes with the other driver. I welcome a thorough investigation by the authorities.'

Meanwhile, Supol claimed that he panicked after the initial crash. Fearing he would hit another car while reversing, he said he ploughed forward instead, causing the SUV to smash through the bridge railing.

Police Major Nattapong said: 'The deceased have been transported to the hospital. We will conduct an investigation following the legal process.'

Despite being one of the wealthiest countries in Asia, Thailand suffers from chronic underinvestment in its highways and education, contributing to its poor road safety levels. Only a handful of African countries are worse.

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.