blue

bus

cable

cables

car

city

coach

commuter

connection

contact

driving

ecological

economical

economy

electric

electrical

electricity

energy

equipment

hanging

lamp

lamppost

light

lighting

line

lines

moving

network

overhead

parallel

passenger

people

power

public

road

route

sky

steel

street

strength

supply

suspension

system

technology

town

traffic

transport

transportation

travel

trolley

trolleybus

two

urban

urbanism

vehicle

view

voltage

wire

wires

wiring