Thompson Road was signed as Metropolitan Route 6 between Carrum and Clyde North in 1989.

This is a $31 million state government-funded project to widen Thompsons Road in Carrum Downs.

[5] This is a $22 million state government-funded project to widen Thompsons Road in Cranbourne.

[6] Construction started in December 2016 on a $175 million state government-funded project to widen the 6.5 km section of Thompsons Road between Carrum Downs and Cranbourne.

The project was completed in mid-2019, with traffic lights installed at the Frankston-Dandenong Road intersection a year later in July 2020.