King County Metro (Metro) is working with the Seattle Department of Transportation (SDOT) on a plan to improve travel times and reliability for the Route 8. The plan focuses on a series of crucial chokepoints for the route along Denny Way. Metro is utilizing grants from the Federal Transit Administration (FTA) & the Federal Highway Administration (FHWA) to pay for the project’s estimated $1.4 million cost. The money will be used to fund a broad series of improvements on Denny Way between Queen Anne Ave N (Uptown) and 15th Ave E (Capitol Hill). The improvements have been identified by Metro, but the exact details about how and when to implement them are still being worked out between Metro and SDOT.

These improvements will occur after Metro has split the 8 into two routes this coming March: the current Route 8 will terminate at Mount Baker Transit Center and the new Route 38 will take over the portion of the current Route 8 between there and Rainier Beach. Splitting the route in two should also improve reliability somewhat, but Denny Way will still remain the route’s Achilles heel.

In general, the tools that Metro is looking at to speed up Route 8 are:

  • Eliminating left turns from Denny Way at intersections, which will reduce the frequency that traffic is stopped behind turning vehicles.
  • Providing right lane queue jumps at some intersections, which will give buses a green before other traffic; and
  • Implementing a bus lane of some kind on the most congested stretch, which is roughly eastbound on Denny Way between Fairview Ave N and Stewart Street.

And while not directly tied to this project, the improvements that are currently being put into place along Westlake Avenue for benefit of the South Lake Union Streetcar and Route 40 will also benefit Route 8. That project will establish new roadway restrictions, including no right turns onto Denny Way from Westlake Avenue. This change will preempt vehicular traffic from turning in front of Route 8 when it is sitting at the Westlake Avenue intersection during a red light phase.

SDOT has recently made traffic signal adjustments to the intersections along Denny Way, in anticipation of the improvements in South Lake Union.

Denny Way Priority Bus Corridor Improvements

The Seattle Transit Master Plan1 (TMP) identifies two different types of transit investment corridors for bus service across the city. The TMP lumps these corridors into future RapidRide+ routes and Priority Bus Corridors.

Priority Bus Corridors in central Seattle. (City of Seattle)
Priority Bus Corridors in central Seattle. (City of Seattle)

The Priority Bus Corridors are the routes or segments of routes that are not good candidates for a higher quality bus rapid transit (BRT) treatment that a RapidRide+ route might receive, either because SDOT does not think the ridership along that route warrants it or because the street(s) where that route runs would not accommodate itself well to the improvements that would be needed to provide higher quality BRT service.

Of these identified Priority Bus Corridors, the one that would yield the highest benefit in terms of reduced travel time compared to the current service is the corridor of Route 8 between Uptown and Capitol Hill. The TMP estimates that if the targeted improvements are implemented, travel time would be reduced by 22% for riders going from one end of the corridor to the other.

A 22% time savings is a better travel time improvement than three of the seven new proposed RapidRide+ bus corridors. This is particularly remarkable due to the fact that RapidRide+ improvements are accompanied by off-board payment and all-door boarding that reduce dwell time, in addition to separating buses from traffic or allowing buses to jump a queue of cars. Improvements to priority bus corridors will only be roadway improvements. In other words, money spent on this corridor is a much higher value investment than in other places in the transit system in terms of capital improvements.

The TMP identifies a much larger cost to improve the corridor: $40 million. The $1.4 million project cost here is a much more targeted improvement focused on the most time-sucking bottlenecks.

These are based on the analysis of seconds saved:

  • Adding a queue jump on Queen Anne Ave N, similar to the one currently in operation between First Avenue and 1st Ave N for buses heading into Queen Anne. The bus would be given the green to turn left onto Denny Way a few seconds ahead of the rest of general traffic, gaining an average of 45 seconds in travel time during PM peak hours and 12 seconds during the AM.
  • Removing parking spaces to allow traffic to flow more freely. Metro largely evaluated the removal of on-street parking in Capitol Hill on E John St between Broadway and 15th Ave E. (Denny Way does not have any parking along it through South Lake Union.)
Denny Way as it is today. Click for larger version. (Graphic by Scott Bonjukian)
Denny Way as it is today. Click for larger version. (Graphic by Scott Bonjukian)

The main time saver for the route will be a bus lane along eastbound Denny Way between Fairview Ave N and Stewart Street. Metro has presented several options to SDOT to rechannelize the corridor to allow a bus lane, but the one that it analyzed in terms of travel time was a long bus lane created by converting a westbound lane to an eastbound general purpose traffic lane, and turning the center lane into a bus lane. This option would require the removal of one westbound bus stop, shown on the map below on the north side of Denny. (Note: Pontius Avenue N is not shown on these maps between Minor Ave N and Stewart St as that street is planned to be subsumed by the Denny Way substation City Light project, which ironically had planned a substantial improvement to the same bus stop.)

Denny Way with center bus lane. Click for larger version. (Graphic by Scott Bonjukian)
Denny Way with center bus lane. Click for larger version. (Graphic by Scott Bonjukian)

Another option is to purchase right-of-way from the developer of the property to the south of Denny on this block, currently in the works to become home to twin 35-story towers containing a hotel and residential complex. This would allow the two westbound lanes to remain, and still provide the space to add a long bus lane by moving the I-5 queue lane further south. This should provide the same amount of time savings as the long bus lane option, and allow the westbound bus stop to remain where it is.

Denny Way with center bus lane and road widening. Click for larger version. (Graphic by Scott Bonjukian)
Denny Way with center bus lane and road widening. Click for larger version. (Graphic by Scott Bonjukian)

The other bus lane options that were assessed were shorter bus lane options near Stewart Street. It’s clear that the closer the bus lane begins to the stop at Stewart, the smaller the amount of time savings that the bus lane will provide, due to the amount of traffic backup that occurs on the block. This option is possibly the least likely option, though probably the most desirable.

Denny Way with short center bus lane. Click for larger version. (Graphic by Scott Bonjukian)
Denny Way with short center bus lane. Click for larger version. (Graphic by Scott Bonjukian)

The right-turn-only lane option would only open up the area directly in front of the Stewart/Denny stop and is the weakest option.

Denny Way with right-turn-only lane. Click for larger version. (Graphic by Scott Bonjukian)
Denny Way with right-turn-only lane. Click for larger version. (Graphic by Scott Bonjukian)

SDOT and Metro are also considering a way to divert I-5 traffic to make Denny less congested and allow the 8 to move more freely around Stewart. This option would not include a bus lane, and would involve closing Yale Ave and diverting traffic to the freeway via a street like Minor Avenue. Even with this option, a bus lane should still be considered. This option was not considered among the initial set of options and only came to be considered fairly recently.

The estimated travel time savings as a whole, during peak hours and assuming the longest bus lane option, are about a minute and a half on average per trip eastbound and a minute westbound. But the real value in these improvements will come with making Route 8 much more reliable than it is now. By providing a way to remove impediments along the length of Denny Way that slow down the bus a little bit each time, and by allowing the 8 to bypass the traffic queuing onto I-5, the bus you are catching should become much more dependable, all along the 8 route from Queen Anne to Mount Baker. Transit riders should be pleased with progress being made to improve the 8 on Denny, as this route will become even more important than it is now with the opening of Capitol Hill station.

The changes are very encouraging for users of the corridor, though they should be expedited as much as possible as this area experiences such rapid growth. Investments that are being made in transit service could have a much bigger impact if high-ridership corridors moved more quickly and efficiently.


Footnotes

  1. The 2012 Transit Master Plan was recently revised in December 2015, the latter version to which this article discusses.

14 COMMENTS

  1. While I appreciate these improvements, and think they will help some, I’m having a hard time imagining them making the #8 reliable to use – I go out of my way to avoid it, and will probably continue to do so. The real solution is either a subway or a gondola. But again, these improvements look great.

    Option 1 is the least we can do. But won’t change much – I rarely see anyone go straight from the right lane.

    Option 2 is my favorite. It’ll back up traffic heading west, but that’s not nearly the problem of eastbound traffic.

    Option 3 – I don’t get the reason for the short bus lane. Even the long one will be blocked by right turners.

    Option 4 – please no. As much as the #8 helps, let’s not build even more roadway in Seattle.

    • I pretty much agree. Option 2 is the best we can hope for without adding more roadway. I think the one-land westbound makes sense because coming off the overpass there’s only one lane westbound anyway – the other is left turn only.

  2. Converting the 8 to a light rail line (often referred to as the “Metro 8 subway” line) needs to be studied ASAP. Putting transit underground will solve all the problems of delays and reliability. It would be a sound investment.

  3. The lane format in option 2 is a great idea and close to how I’ve been saying it should be. Westbound is already one-lane across Stewart, and it works, so this is a no-brainer. However, I really don’t think the bus lane would be necessary for that lane format. Once you get past the I-5 queue, you’re fine. Two eastbound lanes should flow just as well as they do on the overpass today (which needs no bus lane, and has none in option 2). Just separate the right-turn-only lane with posts to prevent last-minute cut-ins. If there were multiple routes, it might make sense, but a bus lane exclusively for the 8? It’ll just be an empty slab for 99% of the day when it could be easing general traffic as well.

    • The bus lane is necessary so that the bus doesn’t have to wait behind cars (which are waiting on the light or waiting for people blocking the box) before picking people up at the bus stop. Additionally. If the bus can get to the front of the queue at the light it can get signal priority and get ahead of the cars going up the hill where it is largely 1 lane. This will prevent it from being slowed by turning cars going up the hill.

      • Signal priority doesn’t do much good here. Traffic will pour around the hill-challenged, diesel 8 bus as it crawls up the hill between signals and stops at Olive before the one-lane portion of the route (which is possibly going to two lanes with no parking, as discussed). All those cars it beat at Stewart will end up in front of it anyway, after being bottle-necked by a likely empty lane serving a single bus line, and possibly by the occasional bus, itself, crawling up the hill. A separated I-5 turn lane and two eastbound lanes would ease traffic for all, including the bus.

        • If it were up to me, I’d also eliminate the left turn lanes on westbound Denny at Fairview and Lenora, and extend the 3:1 lane format in option 2 to Lenora (minus the bus lane). For one, at peak hours, the left at Lenora is impossible anyway; two, traffic to downtown from I-5 continues on Stewart, rather than turning right onto Denny, then left at Fairview; three, traffic from Captiol Hill isn’t likely going downtown via Denny/Fairview rather than Pine, but if so, could have a left-turn opportunity later on Denny to prioritize easing the gridlock at Stewart.

      • If it were up to me, I’d also eliminate the left turn lanes on westbound Denny at Fairview and Lenora, and extend the 3:1 lane format in option 2 to Lenora. For one, at peak hours, the left at Lenora is impossible anyway; two, traffic to downtown from I-5 continues on Stewart, rather than turning right onto Denny, then left at Fairview; three, traffic from Captiol Hill isn’t likely going downtown via Denny/Fairview rather than Pine, but if so, could have a left-turn opportunity later on Denny to prioritize easing the gridlock at Stewart.

  4. Put it underground! Make it a Metro 8 Subway line and invest in the future to account for growth. Let’s do it!

  5. I’m somewhat surprised that I’ve never heard tolling to the mercer/howell entrances of I5 be suggested as a mitigation strategy.

    Though diverting traffic off Deny would make traffic better for the 8, to force dense traffic onto even smaller roads. I think that the areas around I5 on ramps tend to be really challenging for pedestrians and I think a lot of roads would be made worse by some of the proposed changes.

  6. One possibility that isn’t being considered (for now) is to use an alternate street. If and when Bertha gets through digging, the streets north of Denny get connected. Those streets could easily become transit only. Right now there is no through traffic to speak of, so there would be little to no effect on general purpose traffic. You could go across Thomas, for example, from the Seattle Center to Eastlake. You could even go through the Seattle Center if you wanted to be that bold. Eastlake has its own problems, but there is potential there. You could also cut over to Belmont, which would then connect to more of Capitol Hill. In doing so you might encounter local opposition (to buses struggling up the hill). That might be solved by laying enough wire to run it as a trolley, but that isn’t cheap. Regardless, there are a bunch of options available once the SR 99 tunnel is complete. The fact that SDOT isn’t waiting for that is not a good sign, but probably wise.

  7. Does nothing to stop grid-locking from traffic coming from Stewart trying to get to I-5. That whole section is a hot mess, I say: lose the triangular island stop and some of the car park, and put in a roundabout; make left turners from Westbound Denny go round it to go to I-5.

  8. Is there somewhere we can find more information on this project and any updates? I couldn’t find anything on the Metro/SDOT websites.

Comments are closed.