I WISH to alert motorists travelling on Twin Palm Road after or before Memorial Park.
Thieves are throwing stones or putting spikes to cause tyre punctures so as to disorient drivers once they slow down on the humps, usually this happens from 19:00 to 20:00 hours.
They have an unregistered car which they use to track their victims.
Report any suspicious unmarked vehicles parked beside humps.
Woodlands Police has received five reports attacked from Thursday to Saturday.