TRAFFIC is a way of life in Lagos, Africa’s most populous city. Home by some counts to over 20m people, it is among the most notoriously congested places in the world. The “go-slow” piles up long before dawn as businessmen in SUVs and traders in battered buses hit the overburdened roads. It lasts until well after dark. Often the queues can be unfathomable: a rainstorm, a breakdown or a public holiday can condemn a driver to hours in horn-honking hell. Tardy workers proffer one irrefutable excuse: “Traffic is bad.”

Yet the gridlock that Lagosians have suffered in recent weeks is noteworthy even by the city’s horrendous standards. Rush hours have lengthened, and vehicles back up at unusual hours along the bridges linking the mainland with an island business district. Safety concerns are mounting as armed robbers pillage stuck cars while police are far away. Security experts reckon this is symptomatic of a broader increase in organised crime under a new and less competent state government.