If you were one of the people that lives close to work, you now have to compete for jobs with people from further away. Which means that you now have to probably drive 30 miles for a job, since that one a mile down the road is taken up by someone who lives 30 miles away.
On a smaller scale, I grew up in the middle of two medium-sized towns, the one north of me had factories, and the one south of me had other factories. In towns A and B, there were about as many people working from the other town as there were local. But without the roads, everyone would be more likely to work a couple miles from home, and probably be happier (type of work, pay rate, etc were about the same between the two).
On a smaller scale, I grew up in the middle of two medium-sized towns, the one north of me had factories, and the one south of me had other factories. In towns A and B, there were about as many people working from the other town as there were local. But without the roads, everyone would be more likely to work a couple miles from home, and probably be happier (type of work, pay rate, etc were about the same between the two).