I am changing work places. My new commute will take me from the extreme SW of Dallas to the NW of Dallas.
Bicycle only: 23 miles of multi-lane arterials (MLA) with the highest posted speed limit (PSL) of 40 MPH. from home to work. I would need to leave the house 2 hours before 8 AM. (One and a half hour riding, half an hour for cool-down or flats.) The distance and roads are well within my abilities.
Light rail: Five miles to train station closest to my house and then four miles from train station to work on MLA with PSL of 40 MPH. It would cost me $3 each day and I would still have to leave the house at 6 AM. An additional hazard with this plan is that if passenger use is heavy, my bike and I can be kicked off the train.
Mass transit for the entire trip: Walk a half mile to a bus stop to meet the 6:07 AM bus, transfer to rail, then transfer to another bus to arrive at work with about 10 minutes to spare. I should actually have to to meet the 5:47 bus to allow for connection mishaps. In this scenario I would leave the house about 5:30 AM. This commute would also cost $3 a day. ($2.50 a day if I bought a monthly pass for $50 and used it five days a week.)
In my case, with almost door to door service, I can easily travel across town faster on my bicycle than if all or part of the trip were done on mass transit.