The identification and mapping of road hazards is critical to efforts in reducing road crashes through safer road design and road user behaviour change.
In 2013, Safe Way Right Way (SWRW) commissioned a project to map black spots on the Northern Corridor. The Kenya Police Service were instrumental in physical identification of black-spot sections and provided additional information on the patterns and nature of the crashes. 160 black spots were identified in 2013.
In 2017, SWRW commissioned the second phase of the route hazard-mapping project to capture evolution in black spots on the Northern Corridor and expanded the scope to include high-risk roads in Nairobi County as identified by the National Transport and Safety Authority.
The study was also necessary as some sections of the corridor were under construction in 2013. The Northern Corridor is approximately 930 kilometres and runs from Mombasa to Malaba through Nairobi, Nakuru and Eldoret. The Northern Corridor also consists of two arms; Nairobi to Naivasha through Mai Mahiu (52 kilometres) and Mau Summit to Busia through Kericho and Kisumu (approximately 340 kilometres). The Nairobi County high risks roads covered distance of 360 kilometres. The length of road surface mapped is approximately 1,682 kilometres.
The mapping exercise involved identification of new black spots and updating details of those captured in the 2013 survey. The black spot identification and provision of historical data was done by Kenya Police. Geographical coordinates and photos were captured by a team of GIS consultants.