MOBILE speed camera vehicles will feature a distinctive orange stripe after the state government bowed to pressure from motorists and the opposition for them to be marked.

Fines and demerit points will be issued from today after a month-long trial of the cameras in which 1374 drivers were caught speeding but issued only with a warning.

The six Ford Territory ''safety camera vehicles'' will be marked with an orange-and-white stripe and an RTA logo and will be rotated through 150 accident hot spots throughout six regions across the state.

The Minister for Roads, David Borger, said while evidence shows there is a ''marginal benefit'' in unmarked cars, the public feedback calling for transparency was overwhelming.