The accident happened shortly before 9:45am on Heroine-Pa Khlok Rd in Thalang, police said. When authorities arrived on scene they were told by residents that the elderly woman and 5-year-old girl were hit by a car, allegedly at high speed, from behind while the motorbike was switching lanes.
Lt Kraisorn Boonprasop said the police found a damaged Toyota Vios just 150 metres away from the Pa Khlok OrBorTor office. The elderly woman was found on the road, another 20 metres away, with severe head injuries next to a totaled Yamaha motorbike, he added.
Lt Kraisorn said, "We were told by residents that the motorbike's passenger, a 5-year-old girl, was taken to Thalang hospital already by local residents."
Rescue workers took the body of the elderly victim to Thalang hospital while a police escorted the driver of the Toyota, whose name they declined to reveal, to the station.
"According to residents in the area, the victim was riding the motorbike along the road heading to drop off her niece at school. When she came closer to the school, she changed from left to right lane which caused the car behind that came in high speed slammed into the back of her motorbike.
"The impact caused the now-deceased woman, who did not wear her helmet, to bounce off the motorbike and land head first on the road while the 5-year-old suffered minor injuries to her head and body," Lt Kraisorn added.
Police have yet to charge the driver pending an investigation.