Nigeria’s commercial capital city, Lagos, has ranked number one among African cities facing the challenges of road traffic congestion.

Lagos recorded a traffic index of 348.69 among surveyed seven cities in the Dark Continent, Business Insider reports.

According to the report, “The traffic index is the percentage of additional time a road trip takes due to congestion.”

Other African cities mentioned in the report are Kenya’s Nairobi and Egypt’s Cairo – coming second and third with 256.39 and 244.23, respectively.

The other four are South African cities – Pretoria, Cape Town, Johannesburg and Durban having 230.51, 211.92, 201.29 and 121.29, respectively.

The report explains that traffic congestion in these cities is due to “Poor road networks, poor driving and inadequate road management systems are some causes of traffic congestion across African cities.”