Last week, I posted my thoughts on traffic congestion and potential solutions. My observations suggest that adding additional lanes to jammed streets and highways never solves the problem – it simply invites more cars to join the fray.

American drivers apparently have a (very high) set threshold for delays and traffic jams. Until congestion reaches that threshold, we are unwilling to change our behavior or look at alternative transportation strategies. By widening roads we only invite more drivers to fill the gap until more cars are stuck in the same level of congestion as before the widening occurred.

The frustrating part for me is that it seems this pattern is repeated again and again in cities across the country. Widening streets is a costly and inconvenient proposition, yet it seems to be the knee-jerk “solution” no matter how often it is proven ineffective.

According to the 2009 Urban Mobility Report just released by the Texas Transportation Institute (part of Texas A&M University), traffic congestion across the country has actually gone down a bit in the past couple of years. This trend is even more pronounced in Portland, Oregon. It is suspected that smarter development strategies (anti-sprawl planning) and a growing use of mass transit (higher gas prices) are responsible for the downward trend.

Here are some findings:

In 2007, Portland drivers spent an extra 37 hours behind the wheel during rush hour. This is down one hour from 2006 (Nationally, drivers saved about 30 minutes in 2007).

While time spent in rush hour traffic has gone down in the past couple years, it is still much higher than it was five

Congestion USA - latest stats

years ago. In 2007, American drivers spent an additional 34.4 million hours of time in rush hour traffic – up 21 percent from 2002.

Nationwide, getting from point A to point B takes American drivers 25 percent more time during rush hour than during non-commute times (In Portland, it takes almost 30 percent more time).

Portland’s focus on usable mass transit seems to be slowing the rate of congestion growth. While the negative effects of traffic jams typically increase with the size of the city, Portland ranks 34th worst city in rush hour delays even though they are the 24th largest metro area (measured by population). Over the past ten years, commuter delays in Portland rose from 35 hours a year to 37 hours. Nationally, these figures are about 5 times worse (36 hours vs. 41).

It is estimated that, if not for their public transportation system, Portland-area drivers would be adding an additional five hours to their commute time annually – at a cost of about $98 million a year in lost time and wasted gas.

Of course, there are those that continue to demand that we widen roads to solve our traffic problems. To many, mass transit is merely an encroachment on our freedom to drive when, where and how we want. The last thing I feel when I’m sitting in a bumper-to-bumper traffic jam is freedom.