Perth traffic controller's leg amputated in alleged hit-run

A Perth traffic controller has had his leg amputated after he and a co-worker were injured in an alleged hit-run.

Tristan Thomson and Fabio Martins-Rogue were finishing their shift on Great Eastern Highway, Rivervale just before midnight when their ute was slammed into by a passing Mitsubishi SUV.

The two men were trapped between their ute and a trailer as the Mitsubishi driver allegedly continued down the highway.

Mr Thomson's injuries were so severe doctors had to amputate the 35-year-old's right leg.

"He was simply doing his job last night - obviously no one could have imagined the outcome of the phone call we woke up to this morning," Mr Thomson's brother Brendan told 9News.

"We're obviously all processing this morning - what occurred and right now our focus is on his recovery."

Mr Martin-Rogue, 30, was also treated for minor injuries to his arms and legs.

Police say the Mitsubishi driver was discovered a kilometre away on Francisco Place, Lathlain.

Authorities are urging drivers to slow down when approaching road worksites, with 211 people killed or injured in road work zones across WA between 2015 and 2019.

"Slow down, pay attention and comply with the speed limits will keep road workers safe," WA Road Safety Commissioner Adrian Warner said.