Often we look at development and wonder what will happen to traffic. This comes up a lot regarding greater Downtown Seattle, particularly the fast-growing northern portions. Actually, the truth might be pretty good.
The reasons are primarily these: 1. Congestion is mostly about peak times, and some buildings’ users spread their travel throughout the day rather than concentrating at rush hour. 2. A large percentage of growth does not add trips, but rather makes them shorter.
Category 1 includes hotels (a big growth area) as well as colleges, hospitals, retail, and art/tourist attractions. While these have peak times, they mostly spread activity throughout the day and night. Even at hospitals, only portions of the staff work bank hours, and few patients arrive at 8:00 am. Hotel guests arrive all day and evening, stay multiple nights while getting around mostly on foot, then leave throughout the morning. Destination retail is often busiest on weekends. Concerts are mostly at night. College students and faculty keep varying class hours. All of these uses avoid making rush hour much worse, while also activating our parks, spreading their lunch dollars to the slower times, and so on.
Housing falls heavily into Category 2. Greater Downtown residents are often greater Downtown workers. They’d already be traveling to these jobs daily, but living nearby means they can walk, use transit, bike, or drive a short distance instead of a long one. Working residents of the three major Downtown zip codes commuted on foot at rates of 47.6% for 98104, 34.1% for 98101, and 32.3% for 98121 in 2012 per Census.gov. They drove alone (often a much shorter distance) only 22.0%, 21.0% and 38.1% of the time. The gap between those figures was mostly transit, which is also much more convenient when you’re downtown. Working at home is also a major category. Expanding to the north, the 98109 area includes South Lake Union but also half of Queen Anne Hill, so its 13.7% walk and 47.6% drive alone rates are less relevant; perhaps SLU’s numbers are more like 98121’s.
Of course, those figures include people who commute to jobs far away from Downtown, who must represent a big chunk of the drivers and transit riders. The pedestrian numbers should be much higher if you only count those who also work Downtown. As for outbound commutes, these are added trips, but might peak a little earlier than inbound commutes (like 7:00-7:30 instead of 7:30-8:00?), and use the less-congested half of Downtown streets. In any case, it seems likely that most new Downtown residents also work here, so there should be a net reduction in traffic.
Many residents are in Category 1 as well, largely traveling outside commute times. This would include many retirees and students without jobs, who are apparently not counted in the commute statistics. These people seem likely to have low driving rates as well. Category 1 would also apply to many workers with non-traditional hours.
This is all relevant to transportation to and from greater Downtown as well. Turning thousands of 20-mile drives into two-mile drives and half-mile walks must be really helpful. If the current greater Downtown housing boom is around 11,500 units including tendrils up Dexter and Pike/Pine (my guesstimate), how many fewer inbound commutes might that represent, and and how many tax dollars might we avoid in future road projects, let alone less-jammed public transit? Between that savings, construction-related sales taxes, and new tax base upon completion, it’s a wonder we charge development fees rather than incentivizing new housing along with nice thank-you letters.
Offices (as well as laboratories) are the other big category of growth, and of course they contribute to rush hours. But our region needs their economic engine. That engine is best served by allowing companies to locate where workers want to work and companies can be near each other. Locating downtown means they’re transit-accessible and many employees can walk, meaning fewer cars on the road overall. They key is to balance office growth with housing growth. It would help if some companies changed their start times a little, much like the construction industry already has.
The concept of living Downtown is supported by demand. Apartments keep getting built because they keep filling up, at good prices. Maybe people like those leisurely walks to work, and choosing from the Downtown smorgasbord on the way home. Maybe they like walking out their doors on weekends and already being somewhere.
It works in other places too. Want less traffic in Redmond? Keep adding housing in that nice downtown area (seriously, take a look) as well as around Microsoft. Downtown Tacoma? Same thing. Everybody wins.