Which sign allows driving only at the speed indicated (km/h) or higher?

Explanation

Sign number 3; the compulsory minimum speed sign.

The sign that permits movement only at the indicated speed or above is the "minimum speed" sign: a blue circle with a white figure. In the system of signs, colour and shape carry independent meaning, and that is the key to identification; a blue circle belongs to the family of mandatory signs, that is, it tells you what to do — here: do not travel more slowly than that figure. Against it, a white circle with a red border is a prohibitory sign and sets a ceiling on speed, not a floor. A blue rectangular or square sign with a figure shows a recommended speed and creates no legal obligation.

The legislator's logic is speed dispersion, not high speed: in a tunnel, on long bridges and on motorways, one very slow vehicle creates a large speed difference with the traffic flow, forces the drivers behind into risky overtaking and raises the likelihood of rear-end collisions; a uniform flow is safer than an irregular one. Two practical points: if weather or traffic conditions make reaching that speed impossible, safety and the actual road conditions take priority; and a vehicle technically incapable of reaching that speed has no business entering this zone.

• A white circle with a red border and a figure sets the maximum speed, not the minimum; it is the exact opposite of the sign asked about. • A blue rectangular or square sign with a figure is a recommended speed and is not binding.

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