Is this handwritten licence plate on lorry allowed?

Stomper Alvin noticed a lorry with a handwritten licence plate travelling along Serangoon Garden Way yesterday evening (Dec 31).

He wondered if such a licence plate is even allowed on the roads.

Said the Stomper:

"It appears to be made from a wooden plank and hand written with black marker. 

"I wonder if the driver knows if it is illegal to have such a 'special' number plate."