"Container terminals try to discourage long dwell times for cargo, and Lagos' gridlock shows why. Overtime cargo has been identified as a leading cause for the persistent port congestion in Nigeria. Official customs data show that over 8,000 overtime containers valued at $6 billion are abandoned at the major Nigerian terminals, Onne Port and Lagos Ports (Tin Can and Apapa)." See the original story at The Maritime Executive.
Source: The Maritime Executive