I live in large dense city in the US (Los Angeles). I live a 15-20 minute car ride from work. The city is going to be doing some construction on my route and have asked the businesses to encourage their employees to take public transit, walk, bike, etc. during the construction. I looked into taking the bus, which for the first time in my life, is a reasonable walk from my home. It would increase my commute time (one way) from 20 minutes to 50 minutes! Sorry, but I don't have an extra hour I can take out of my day for that. It would be better to just work from home, but my employer won't let me do that for the duration of the construction which is supposed to last a year or two.
EDIT: For about a month, my office was at the Santa Monica end of the train. (Like literally right next to the train stop.) Sadly it no longer is. Even then, a coworker decided to take the train once from his place in Pasadena. His normally 45-60 minute commute increased to an hour and 50 minutes taking public transport. Sorry, but he'll just drive instead.