Lanes **reserved for certain vehicles** are those that are exclusively intended for a specific type of vehicle, such as buses, bicycles, or taxis. This means that only those vehicles can use them, and other vehicles are not allowed to drive on them. This exclusivity is what makes them not considered for the normal use of the road by all drivers.

On the other hand, **special** and **reversible lanes** have different characteristics. Special lanes may include additional lanes or lanes in the opposite direction to the usual, which are used to improve traffic flow in specific situations, such as during peak hours or during roadworks. Reversible lanes change direction according to traffic needs, but they are not reserved for a specific type of vehicle.

In summary, lanes reserved for certain vehicles are not considered for normal use because they are designed for exclusive use, unlike special or reversible lanes that can be used by different types of vehicles under certain conditions.