Who gets in the most accidents?

accidents by user

The above graph shows the number accidents involving each type of road users. Note that some accidents involved more than one type of road user and thus could be counted more than once (N=1339).

Although private cars are the type of vehicle most often in an accident, when taking into account the number of people affected by a single accident, PSVs affect the most people because they carry the most. In the graph below a conservative estimate of five passengers is used to demonstrate the comparative effect of PSV accidents versus those involving other road users.estimated affected users

Rush Hour

How does the time of day affect accidents? Not surprisingly, accidents follow other traffic patterns. In the morning peak (6 – 9 AM) concentrations are farther out (as everyone is coming into the center of the city), whereas in the evening peak (4 – 9 PM) accidents are more centered near the CBD.

Try turning on layers (one for morning, one for evening) one at a time so you can see the difference.

AM rush
AM Rush (6-9 AM): Accidents are clustered on the main roads leading into the city.
PM rush
PM Rush (4-9 PM): Accidents are focused in the center of the city.

When do most accidents occur?


accidents by hour

The above graph shows the total accidents (N=1,900) by the time they were first reported. Two clear peaks are evident during peak commuting (and traffic) hours.

The following graph shows that on average more accidents occur on Fridays and Saturdays.

accidents by day

PSV Accidents

psv nrb reports size

PSV (public service vehicles) accidents affect the most people and are reported the more than accidents involving other road users. This map shows all the accidents in Nairobi County that involved a PSV (N = 253). The size of the dot represents the number of reports came in about a specific accident.

In Detail

Because a map can obscure the human details of an event such as an accident, let’s look at some of the most reported accidents in more detail.

May 25, 7:45 PM – Thika Road at Githurai. A bus overturns and rolls over two cars. No fatalities reported. 43 reports. (Photo via @wanjumbi68)
June 18, 6:38 PM – Jogoo Road at Donholm Roundabout. Two buses collide. Two fatalities and several injuries reported. 109 reports. (Photo via @FrankPascalBar)
June 29, 1:15 PM – Langata Road. A bus overturns. One fatality and several injuries reported. 57 reports. (Photo via @Karanjjah)
Sept. 30, 4:30 PM – Valley Road near Integrity Center. A bus his a boda and overturns. 55 reports. (Photo via @andrewmunuve)