Why does driving on this stretch of road require greater alertness on the part of the motorist?

Your answer is fully correct because all three points highlight important safety considerations for driving on this road with tram tracks.

1. The uneven road surface and varying road grip are common where tram tracks are embedded in the street. This can affect your vehicle’s stability, especially in wet or icy conditions, so you need to be alert and drive carefully.

2. Trams can come from the opposite direction and often have right of way. Since you share the road with trams, you must watch carefully and be prepared to yield to them to avoid collisions.

3. Driving on the tram tracks is dangerous because your tires can get caught in the grooves, causing loss of control. It’s safest to avoid driving directly on the tracks unless you are turning or if it is necessary.

In summary, when driving where there are tram tracks, you must be extra cautious due to the road surface, potential tram traffic, and the dangers of driving on the tracks themselves. This is why greater alertness is required.