This indicator is implemented into the National Model System (NMS) and the results have been applied for the strategic NMCA study of 2016 (‘National Market and Capacity Analyses’). It is developed as an indicator for the quality of door-to-door accessibility of locations by PT. Starting point of the indicator is the BBI indicator for car that was created and applied in the SVIR policy outlook for infrastructure and spatial planning. The specifications of the BBI indicator are adjusted to make the indicator representative for PT, as perceived by the traveller.
The BBI-score represents the average speed from all door-to-door trips, with the distance measured as the crow flow flies. The BBI-index represents the ratio between the BBI-score and a reference line of the expected PT speed which is distance-dependent (or the speed in the reference scenario). The first part of the analysis is the display of the BBI-index on a map. This map shows the accessibility quality of locations by PT.
In addition, a BBI-ov dashboard is developed: this is a user friendly Excel tool, with the possibility to create additional figures on PT accessibility for specific zones. These figures can be used to explore the BBI-ov score in detail: in which directions can we find the biggest bottlenecks? A dartboard can be created containing BBI-ov scores per wind direction and distance class. In which part of the PT journey is the quality lacking? For this analysis a spider graphs with scores per travel time component are shown.