The reduced driving speed and driving in a column do not represent a main risk factor when driving through road tunnels.
The main risk factor that you must take into account when driving the motor vehicle through road tunnels is the difficulty of adapting the vision to the sudden change between natural light and artificial light, both at the entrance and at the exit. This transition can cause a phenomenon known as “temporary blindness”.
The possibility of the existence of some unevenness of the carriageway does not represent a main risk factor when driving through road tunnels.
The correct answer is: B
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