"In a large working session on the design of Playa Vista, an urban infill project in Los Angeles, the traffic engineer was presenting a report of current and projected congestion around the development. From our seat by the window, we had an unobstructed rush-hour view of a street he had diagnosed as highly congested and in need of widening. Why, then, was traffic flowing smoothly, with hardly any stacking at the traffic light? When we asked, the traffic engineer offered an answer that should be recorded permanently in the annals of the profession: 'The computer model that we use does not necessarily bear any relationship to reality.'"
-- Andres Duany, Elizabeth Plater-Zyberk, and Jeff Speck