Horse-drawn carriages are no longer a common mode of transportation in most urban areas.

Bus rapid transit (BRT) is a system of dedicated lanes for buses and other high-occupancy vehicles, typically with stations and pre-paid fares.

Trolleybuses are electric buses that draw power from overhead wires, while metros, trams, and monorails are all types of rail-based urban transportation.

Bike sharing is a system of shared bicycles that can be rented and returned at various locations throughout a city.

Good weather is not a factor that can contribute to traffic congestion.

A pedestrian zone is a system of dedicated lanes for pedestrians and cyclists, typically in a city center or other busy area.

Traffic signals are not a type of traffic calming measure, as they are designed to control the flow of traffic rather than slow it down.

Electric mass transit is a system of public transportation that uses electric-powered vehicles, such as electric buses, trams, and trains.

Social isolation is not a benefit of public transportation.

Autonomous public transportation is a system of public transportation that uses driverless vehicles, such as self-driving buses and trains.

Good public transportation is not a challenge associated with urban transportation.

Shared mobility is a system of public transportation that uses shared vehicles, such as carsharing, bikesharing, and scooter sharing.

Traffic calming is a type of engineering measure designed to slow down traffic, while transportation demand management (TDM), land use planning, public transportation subsidies, and road pricing are all types of urban transportation policies.

A maglev train is a system of public transportation that uses magnetic levitation (maglev) technology to levitate the train above the track, reducing friction and allowing for very high speeds.

Airports are not a type of urban transportation infrastructure, as they are located outside of urban areas.