I've modified mine for safety as well as recreation. My morning ride isn't much longer for the commuter, I just choose different streets to ride down to avoid having to cut over four lanes of insane morning motorists doing 40-45 My ride home is about twice as long but that's because I hit the trail in the for the ride home - I can go fast, avoid pot holes, not fear for my life being ended by a semi or crazed motorist, ditch all of the construction (which just adds to the irritability of the motorists) and have fun riding along side a very scenic river route* (for most of the way) I'm slowly working on getting my butt out of bed earlier to hit the trail for the ride in to work.

* I never realized that there could be this nice of a route where I live (Lansing, MI). It was kind of exciting finding the River Trail because it shows a completely different side to Lansing than I am used to.