The division bench of Justices M R Shah and K J Thaker ordered the Director General of Police that such number plates should be seized and action be taken against the owner under the rules of Regional Transport Office (RTO).
As per the order, no vehicle-owner can put his/her name or designation on the number-plate.
The High Court also directed the administrative secretary, ports and transport secretary and additional chief secretary of home department to implement rules banning use of illegal beacons on car-tops.
The order came in response to a petition filed by Junagadh -based K B Sanghvi. Last August, the High Court had directed Gujarat government to remove illegal beacons from vehicles, but the state failed to act, Sanghvi said, seeking action for contempt of court.