Nigeria, July 6 -- Every day, thousands of motorists, commercial bus drivers and commuters travel along the Apapa-Oworonshoki Expressway, one of Lagos' busiest transport corridors. For many, the journey is defined by slow-moving traffic and the endless stream of trucks travelling to and from Nigeria's busiest seaports.

Hidden beneath that daily movement, however, is a problem many road users never notice.

Along several stretches of the expressway, drainage channels meant to carry run-off water are clogged with plastic bottles, nylon bags, food packs and other refuse.

In many places, the waste has almost buried the drains, leaving stagnant water trapped beneath it. During a visit to the area on Friday and on Monday, PREMIUM TIMES also o...