Allen Junction
Changing Traffic Circle (Roundabout) to 4-way intersection is not technically the best way to go at Allen junction in Lagos mainland.
4 way intersection has 32 traffic point which Lagos State Government is trying to control with traffic lights. The disadvantages are: To be effective a lot of traffic survey must be conducted to determine travel time that shall be used to calibrate the traffic lights. Also failure as a result of lack of maintenance and vandalism present major challenge. From Nigeria experience, complex traffic lights provide basis for extortion of motorist by corrupt officials and police personnel.
A better approach should be traffic separation which is partly implement at the site and carriage way staggering which if combined with traffic lights would have reduced the traffic conflict to probably 8 from 32.
