**Vertical service signs** are those that inform about services available to drivers and pedestrians, such as restaurants, ambulance bases, gas stations, among others. These signs are easily identifiable and are designed to provide useful information during the journey.

- The **restaurant sign** and the **ambulance base** are examples of vertical service signs. The restaurant sign indicates the presence of a restaurant, while the ambulance base sign indicates a place where ambulances are available to attend emergencies.

- On the other hand, the **bus lane** is not a service sign. This sign belongs to another type of signage that regulates the use of lanes on the road, indicating that a specific lane is exclusively for buses. It does not provide information about available services, but rather regulates traffic.

Therefore, the bus lane is not a vertical service sign, unlike the other options mentioned.