Added first step of travel time calculation

docs/applying.md

@@ -99,3 +99,17 @@ Several new attributes were added to allow the user to configure how flexible fl
 | StartPeriod                | Time period to start service (not yet implemented)                                                                                           | 9 for both      |
 | EndPeriod                  | Time period to end service (not yet implemented)                                                                                             | MT: 32, NEV: 38 |
 | maxWalkIfMTAccessAvailable | Maximum disatance someone is willing to walk at the destination end if flexible fleet services are available (same for microtransit and NEV) | 0.5             |
+
+### Travel time calculation
+The flexible fleet travel time calculation is a two-step process. The first step is to calculate the time that it would take to travel from the origin to the destination* directly without any diversion to pick up or drop off any passengers. This is done by taking the maximum of the time implied by the operating speed and the congested travel time:
+
+$t_{\textnormal{direct}}=\textnormal{max}(60\times\frac{s}{d}, t_{\textnormal{congested}})$
+
+where:
+
+$t_{\textnormal{direct}} = \textnormal{Direct flexible fleet travel time}$\
+$s = \textnormal{speed}$\
+$d = \textnormal{Distance from origin to destination (taken from distance skim)}$\
+$t_{\textnormal{congested}} = \textnormal{Congested travel time from origin to destination (taken from Shared Ride 3 time skim)}$
+
+**When used to access fixed-route transit, the destination is the nearest transit stop to the trip origin. When used to egress from fixed-route transit, the origin is the nearest transit stop to the trip destination.*