==First and Last Mile==
First and last mile is a common expression referring to how people get to a transit station, and how they get from transit to their destination. These considerations recognize that the time it takes to travel by transit is broken up into four pieces: Travel to the station, waiting at the station, travel on transit, and travel to destination. More complicated trips may include other elements such as waiting for a transfer, or traveling between stations to transfer. Some tools only look at travel time between stations, with the possible inclusion of wait time (usually calculated as half of headway). In that case they use circular buffers to determine which populations and destinations are accessible
from the stations. Other tools incorporate travel time to and from the stations by using circular buffers and averages or by calculating travel time on the street network.