Question

One reason you may wish to estimate your travel time is so that you can inform others of your expected arrival time.

Answer 1

So you can schedule events or work meetings/conferences.

Here is an example below :

I'am in Tallahassee Fl and it's 12:25, but I need to be in Thomas'ville Ga at 1:00, it takes me 30 minutes to get there but it takes me 5 minutes to leave town , I would probably arrive sometime around 12:55 , this leaves me 5 minutes early.

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I really hope that this helps you a lot.