Urban planning and design is hugely important; and I love seeing the few examples of interesting concepts around the world. A few I've noticed and visited recently:

- Chicago: the 2- or 3-level streets around the riverfront are pretty awesome. Separating local traffic from through-traffic and commercial traffic. Loading docks and heavy traffic can all be hidden from view underground. - Amsterdam: as one of the most biking-friendly cities in the world; there are bike lanes everywhere. Bike lanes are separated from the road by parking lanes, and intersection also separate the bike lames from the road by giving them independent crosswalks with a raised curb for protection. The canals also allow everyone to enjoy a trip anywhere in the city center via boat. - Shanghai: the CBD's main buildings is connected via elevated walkways that go above the road.

I think the future would have all car traffic underground or pedestrian and bike friendly on elevated walkways.