Road Classification

Why — Explanation

Asphalt in good condition gives the tyres a good level of grip. It does not increase the braking distance, and worn asphalt reduces grip rather than only affecting braking.

Why — Explanation

Diesel on the road cuts tyre grip sharply, so braking becomes less effective and the motorcycle needs a greater distance to stop.

Why — Explanation

On motorways traffic moves fast, so before any manoeuvre riders must use the mirrors to judge the higher approach speeds of other vehicles.

Why — Explanation

A lane reserved for bicycles may not be used by motorcycles, even though both are two-wheeled vehicles.

Why — Explanation

Fallen leaves form a slippery layer between the tyres and the asphalt, so grip is reduced.

Why — Explanation

A wet surface reduces friction between the tyres and the road, so grip falls and instability rises.

Why — Explanation

Built-up areas have pedestrians, frequent junctions, shops and varied traffic, which create more distractions.

Why — Explanation

In adverse conditions such as snow or ice, tyre grip falls sharply and visibility is reduced, so the rider must moderate speed and increase safety distances.

Why — Explanation

The sign warns of loose gravel on the road. Loose stones reduce tyre grip and can seriously affect the stability of a two-wheeled vehicle.

Why — Explanation

The road is divided by a continuous longitudinal line, and it is forbidden to ride over or cross a continuous line to overtake.

Why — Explanation

Aquaplaning occurs when a film of water builds up between the tyres and the road surface, so water on the road is the essential factor behind it.

Why — Explanation

Only motorways guarantee that all junctions are grade-separated. On other public roads the rider can find level junctions.

Why — Explanation

Tracks open to public traffic are public roads and are fully subject to the rules of the Highway Code.

Why — Explanation

Larger wheels cross small depressions more easily without sinking in, so the motorcycle stays more stable and the ride is safer and more comfortable.

Why — Explanation

On wet or slippery surfaces tyre grip falls, so the braking distance increases, not decreases.

Why — Explanation

Green-background signs identify main routes (itinerários principais). On motorways the direction and confirmation signs have a blue background.

Why — Explanation

The green confirmation sign and the red kilometre marker with the IP2 code clearly identify a main route (Itinerário Principal, IP).

Why — Explanation

Metal manhole covers give much less grip than asphalt, especially when wet, which is a serious risk for a vehicle that balances on two wheels.

Why — Explanation

This is the definition of a public road: a land route intended for public traffic, such as roads, streets, tracks and squares.

Why — Explanation

Pedestrians, vehicles turning or parking and nearby junctions make the urban environment change very fast, so constant attention is required.