I ran across this interesting article on the Atlantic Cities blog. Here's a quote:
"...[T]here are two ways to shift more commuters out of single-occupancy vehicles and into other modes of transportation, whether that's biking, carpooling, walking, or transit. We can incentivize transit by making all of those other options more attractive. Or we can disincentivize driving by making it less so. What's become increasingly apparent in the United States is that we'll only get so far playing to the first strategy without incorporating the second..."
From America's Cities Are Still Too Afraid to Make Driving Unappealing - CityLab
What do you think? Do we need more of the stick along with the carrot?