Excellent; you raise a good point or two
Quote:
Originally Posted by mhays
Induced demand is very real. There's a broad consensus in the planning world (the paid stooges seeming to be the main opposition).
When a highway is widened, it seems reasonable to commute the extra distance (until it fills up). So people drive a little farther, live a little further out, etc.
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I wouldn't necessarily disagree with this but it also raises a critical difference between Seattle and Denver. So let's compare and contrast the two cities. As I often say 'context' is everything. This should help define the role of 'induced' demand in each city.
Denver has two critical
interstate freeways: I-70 which goes east and west and I-25 which goes north and south. Both are critical to the movement of goods and services.
I-70 goes out to Denver International Airport. As the county's 3rd busiest airport this a Big Deal. Also along I-70 between downtown and closer to the airport is where the largest volume of warehousing exists. I know you're familiar with Amazon and its over 60,000 employees in the Seattle/area and that's a boatload of commuters.
Amazon b/c of its e-commerce growth has Amazon drivers all over the place. Then add in FedEx, UPS and all the local delivery guys and that's a boatload of drivers but not commuters - and we haven't even considered all the 18-wheelers. In addition to the airport I-70 is also the key access into the mountains to the west with all its ski areas etc.
I recently walked along 3rd Ave in Seattle (via video) and what jumped out at me (and especially considering the greater downtown area and not just the CBD) is how much bigger (spread out) and how much denser Seattle is compared to Denver. Being lazy I'll guestimate that Seattle has easily 4X the number of commuters to the downtown area as does Denver.
With respect to I-25 it's much the same story as I-70. It's worth pointing out that although Denver is the densest, the population has mainly grown along the front range going north and south.
Yes of course commuters use both Denver freeways but there's not the same commuting pattern to downtown as you have in Seattle.