Dashcam footage has emerged showing how the 40km/h slow down rule affects truck drivers on the highway.

A truck driver has had to quickly slow down to almost half his speed after seeing flashing police lights as he rounded a bend.

The rule was introduced six months ago, instructing motorists to slow down to 40km/h when passing stationary emergency vehicles with their lights flashing.

See the video below.

This is how it looks from my chair! I’m doing nothing illegal. I’m unsighted by the truck in the left lane. It’s a constant radius left curve. This is a bad law and the trial should be scrapped in my opinion. pic.twitter.com/BIDPwNQZ5P

— Oz (Mike) (@theoztrucker) March 12, 2019

Truck driver Mike tells Chris Smith drivers are more at risk with winter approaching.

“I only had a couple of seconds to respond to what was going on.

“There are enough natural obstacles… that are causing problems and we’ve created a manmade one.”

Click PLAY below to listen to the full interview