Congested airport facilities in Lagos often lead to long delays, and airline reservations may not be honored due to overbooking, especially on domestic flights. Domestic airline schedules are fairly reliable and lack of aviation fuel can delay or cancel flights. Travelers on international flights should arrive at the airport at least two hours before scheduled departure. Air accidents in recent years have increased concern about maintenance standards on domestic airlines. Deep ruts and potholes abound.
Roads flood in torrential rainstorms.
There are no traffic lights or stop signs. Traffic congestion in built up areas often causes gridlock. Failure to promptly remove disabled vehicles, corpses and other obstacles from the roadway further contributes to traffic congestion and compounds unsafe driving practices. Street lighting is insufficient and often out of order, making night driving all the more risky. Although Nigeria lies within the tropics, its climate varies considerably from north to south.