Air
A runway that cannot be used because of heavy fog
Fogbound runway
A change to the train platform where a train arrives or departs
Platform alteration
A ship or ferry leaving later than planned
Delayed sailing
A long line of vehicles waiting in traffic
Long tailback
Sudden, rough movement of an aircraft caused by air currents
Turbulence
Repair or construction work on roads or railways
Engineering work
Very bad weather, especially strong wind or storms
Rough weather
When one or more traffic lanes are closed
Lane closure
Luggage that has gone missing during a journey
Lost baggage
Faults in the system that controls train movements
Signalling problems
The time when the sea level is at its lowest
Low tide
A fee paid for driving in a busy city area
Congestion charge