Brent and Christine Laurenson know what they are doing is probably not good for them - certainly when it comes to their emotional wellbeing.
They've been warned they could burn out within a year, but they're determined to plough on.
Brent and Christine are reliving their son's tragic death, re-telling it over and over, drumming home their message that speed kills.
Road safety campaigns come and go, but as Jendy Harper found, the Laurensons' personal plea is very hard to ignore.
Watch the video to see their story.