Joe
Thanks for the thoughtful questions based on your knowledge of the Seattle area. If any major metropolitan area is looking for a good example of what NOT to do to provide for a economical transportation we might be it!
My relatives live in Redmond, Seattle and Camano. I-5, 405, I-90, and 520 are all at capacity most of the work day. Should more lanes be added to these roads increase capacity? Would this be the best solution to the area's increasing traffic problems?
In a word YES!
In the 1950s and 60 the Washington State Highway Department developed excellent plans to build highways that would still be serving us well in the 21st century. In the later 60s and the 70s the state failed to follow through on those construction plans. We are paying a high cost for that shortsightedness every day now.
Fifty years ago the 520 floating bridge was supposed to be 6 lanes. The state legislature cut the budget and built four. Fifty years later they are replacing the bridge with, hold it, four lanes plus two carpool lanes.
The I-90 bridge was planned to be 10 lanes plus the original 4 lane US 10 was to be retained as a local business access highway. Instead we have 6 lanes plus two reversible HOV lanes. There are plans to take away two lanes from carpools and buses and replace them with light rail. The light rail will serve fewer passengers in a smaller area at greater cost than the current buses and that is using the rail agencies numbers.
The R.H. Thompson expressway was planned to link 520 and I-90 on the west side of the lake while avoiding downtown Seattle. Forty years after construction was started and abruptly stopped you can still see the "Bridges to Nowhere" where the interchange with 520 would have been.
Should another auto bridge be built across Lake Washington?
In fact there were plans for a third floating bridge (really a fourth with two across Mercer Island) from Sand Point to Juanita.
And there were plans for addition north-south highways: the Harbor Freeway, 605 in east Bellevue, 805 on the Sammamish Plateau.
Instead of building for the future we had a series of bad decisions by the legislature, nimby law suites, a change in governors from a pro highway democrat republican in love with nuclear plants (WhoPPS!), two one term governors and then 32 consecutive years with Europhile democrats in the governors mansion and an exodus of working families from Seattle. Like Portland, Seattle has become a very non-centrist place that is easy fodder for satire like Portlandia. Transportation decisions these days are more influenced by repeated slogans or quasi-religious beliefs than any process involving math. Google "Mayor McSchwinn" and you can see that all transportation problems in Seattle now will be solved by lowering traffic capacity to add bike lanes. I'm not kidding!
Should the government buy a fleet of buses instead of building light rail or using Amtrak or the equivalent to move people along these corridors?
That would be the most cost effective method of improving mass transit. Our local transit agencies have ample numbers to prove it. Sound transit's commuter rail service the the least cost effective mode by a wide margin. Sound Transit light rail is next most expensive mode. Buses, including bus rapid transit offers service to far more riders for the dollar. Buses are also far more flexible as travel patterns change. But buses are less Euro so we are spending billions of local tax dollars on the least effective modes.
Rail may not pay for itself but it may be least expensive of the available alternatives to keep our economy moving.
If rail is the most cost effective means of providing transportation I'm all for it. I do like trains. But the numbers just don't support passenger trains very often. Take a look at Seattle, we are proving it!