"Is it because they see the truck and think it's travelling slow? Or because we're professional drivers and think we should stop for them?"
She posted the dashcam footage to her YouTube and Facebook pages to raise awareness about the dangers amateur drivers create on Kiwi roads.
Frustrated, she also wanted police to take a more active role in locating the offenders reported by truckies.
"You ring *555 to report the driver, they tell you there are no [police] patrols in the area, but then 10-15 minutes down the road you see a patrol parked up checking people's speeds."
She said her husband frets about her profession, but despite the danger Johns loves her job.
"Yeah, every day I'm worried. Every day it's always in the back of your mind that you might be involved in a really bad one," she said.