PassMotor Cycle Engine Size Limit
Where: Beneath a regulatory sign on roads where a restriction applies only to motor cycles above a certain engine capacity — for example a freeway or a route closed to small-capacity machines.
Purpose: To state an engine capacity limit, in cubic centimetres, for motor cycles. It decides which riders the sign above applies to.
Action Required by Driver: Know your machine's engine capacity — it is on your registration papers and usually stamped on the engine. Compare it with the figure on the plate and apply the sign above accordingly.
Why engine capacity appears on road signs at all
Capacity is a rough proxy for performance, and some roads are restricted on that basis. It also matters for licence codes: a code A1 licence covers a motor cycle whose engine does not exceed 125 cm³, which is why that figure appears so often.
The figure on the sign is an example
This sign is a template. The number printed on the real sign is set by the road authority for that particular road, bridge or structure, so always read the figure in front of you rather than remembering the one shown here.