The anti-speeding drive is being staged as a true marathon from 6AM until 6PM. Fixed and mobile speed cameras will all be used. An earlier action caught 20,000 Belgian motorists speeding.
Following a ruling by Belgium's Constitutional Court all police officers are expected to work until they are 62, while earlier a number could retire at 58.
VSOA's Vincent Houssin: "It's quite possible that we will strike. We are constantly planning actions and the anti-speeding marathon is an ideal opportunity."
The impact of any strike action on the drive is unclear.