Percent Mode Share to Bus
A bus trip is defined as a journey by bus from origin to destination. A bus trip may consist of more than one boarding if an interchange is needed because there is no direct connection between the origin and destination.

The percentage is measured by dividing the number of passenger trips by bus over a given period (usually an average weekday) by the total number of passenger trips in the urban area over the same period.

The percent mode share to bus gives an overall measure of the importance of bus transport in any city and this measure should be considered together with the overall percent of public transport in the city. Both percentages are best obtained from the results of a household survey carried out as part of an urban transport study. However since urban transport studies tend to be made infrequently, updates of the percent mode share to bus can be made by more simple means. The daily bus trips can be obtained by dividing the daily boardings by the average boardings per trip and the total trips can be obtained by multiplying the population by the average trip rate obtained at the most recent household survey.

Where policy decisions have been taken to increase the mode share of public transport in general and bus in particular it is important to be able to measure these percentages in a consistent manner.