Highway Cops 8-4

There's a mysterious crash near Christchurch. Meanwhile, another driver is slow to let others pass but quick to argue with police.

Salmon secrets from a speeding fisher, a truck tumbles over a ledge, and a lame mustang blocks traffic on a Taranaki highway.

A head-on close call on the Milford Road shocks Constable Dwight Grieve, and a car with mods doesn't con Constable Justin Bateup.