"The new arteries immediately became choked, because the secondary routes were deemed unsatisfactory or difficult by traveling public, and because the easier it was made to get some place else, the more people wanted to go. 'Sunday driving' as a phenomenon can be explained rationally only one way -- the places people live in are so unpleasant almost any discomfort of hot and crowded roads semms better, (...)"
1. What does the author mean with the blue sentence?
2. What is "Sunday driving"?
Please help!