Wow, this is an amazing median stormwater project in Paso Robles by MIG/SvR. Photo from MIG/SvR.
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Dongho Chang
@dongho_chang
Personal account. Serving as State Traffic Engineer, former City Traffic Engineer for Seattle and City of Everett, & Zamboni driver. Tweets & views are my own.
SeattleJoined August 2013
Dongho Chang’s Tweets
Walking is the most basic and fundamental mode of transportation. We have to prioritize it much more as a society.
Vehicles should not be able to operate at 100+ mph. We limit electric assist bicycles to 20 mph. Could we do the same for motorcycles/automobiles?
Crazy idea #3: Default no turn on red. Turns on red can be allowed with signing, when context makes it desirable. Right turn on red prioritizes the wrong mode, especially in urban/main street settings.
Crazy idea: convert two-way streets to one-way streets in urban grids and town centers. Repurpose half of street for other uses: people space, people powered mobility, and transit. Intersections are more efficient now, cross walk dancing phases are possible, and it can be piloted
First campus to deliver mail by e-bike in the country. Saves time and $100k in fuel per year. instagr.am/p/CgvM9iyJlWI/
Seattle's SEA Street (Street Edge Alternative). Two years of monitoring show that SEA Street has reduced the total volume of stormwater leaving the street by 99 percent.
Stormwater calming street in action. Overflows on upstream cells. Downstream cells still have storage capacity.
Awful that this is something people install instagr.am/p/ChlEWxzv4bW/
From 2006 to 2017, people living in Seattle increased by 23%, transit ridership increased 46%, police reported traffic collisions decreased 21%, and daily traffic volumes declined slightly by 5%.
It's water under the bridge... storm water treatment, under a bridge.
Row homes for 9 families under way on site of two single family homes in Magnolia instagr.am/p/CZDD4OvvsqX/
Tree planted in former travel lane. Tree chicane. instagr.am/p/CdlewNgFvXv/
We should consider energy efficient speed limits for our freeways again. It could also save lives.
We should not have breakaway poles and signs where we have people walking on sidewalks.
Traffic engineering profession is not being held accountable for what is happening on our streets. Excess traffic lanes, speeding, conditions dictated by our professional standards. annual meeting. @rrinoak
Slip lane closed and replaced with trees for better people space. 12th and Boren.
Bridge over naturally filtered water. Swales of Pontius. Before photo of prior street configuration.
Perfect fit. Urban freight delivery options being tested in Portland.
Your driver license/state ID should be usable as a bus/transit pass. License fee pays for transit service and helps keeps streets working better for all users by funding reliable transit.
Sometimes, a street's primary function isn't movement and efficiency.
When this separated bicycling connection in Magnolia was installed, some riders told us they preferred riding in traffic and this facility made it slower for them. I met with one upset rider and we talked 30 min, agreeing to disagree. His child is now riding & changed his mind.
Proposed high speed rail system map connecting major cities throughout the USA...
Crazy idea #2: urban/main street town centers are destinations and not throughways. Create a central plaza/gathering civic public space by repurposing street space. Superblocks that direct toward the destination but not through. Transit, walking, and rolling is the through paths.
Crazy idea #7: Sidewalk construction, operation, and maintenance is a public function and is funded that way. Elevate crosswalks, especially across minor streets and driveways.
Replying to
Before/after Google street view of revision:
We should change the state statute to allow people to initiate crossing in the crosswalk during the countdown portion if there is a countdown display. A person can gauge whether there is sufficient time to complete the crossing with the countdown.
Seattle is No. 1 for drop in drive alone commuting: "These numbers suggest that people will choose transit if it’s more convenient than driving. No region has invested more in transit than the Seattle metro area." bit.ly/2XEbBZc
Leading pedestrian interval provides early crosswalk walk light for people. 40 locations in Seattle with 1+ year of after data indicate 33% reduction in pedestrian collisions compared with 3 years of before data (per Vision Zero team).
Working for the public sector is what gives me joy. Feeling vulnerable having someone public disclosure all my performance reviews, correspondence, and my personnel records for unknown reasons. It gives me pause and understand why some leave public service.
Wow, Seattle's commute to work results from 2018 Census data! Increase in transit, walking, and biking. Decrease in drive alone and carpool...
85th percentile speed at Emerson Elementary School was 33.9mph. We installed speed humps in 2014. 85th percentile speed is now 21.3mph. Percent of drivers exceeding 35mph (10% before) is now zero. Percent of drivers exceeding 25mph is reduced by 97% per our Vision Zero team.
Portion of West green Lake is now closed to vehicles. Open to safe distancing people walking and rolling.
Our street design and incremental changes are influenced by national guidelines that use science as basis. Science/research is mostly controlled/funded by State Highway agencies. There are changes coming from thoughtful leaders and progressive States. I feel our system is broken.
Thank you, SDOT team. It's been such a great experience. instagr.am/p/CT4yMaJFj6t/
Safety professionals who object to context appropriate treatments that reduces speed/speeding and the severity of injuries from speed related crashes... should reassess their role in the profession and value they bring to people they serve.
"Two-thirds of Seattle residents said they would prefer to make it easier to travel without a car rather than make it easier to drive." Reporting by bit.ly/2U1Xx8B
Vision Zero Team: speed limit reductions to 25 mph in/near urban areas with just signs reduced high end speeding (40+ mph) by 45-65%, collisions dropped by 18-39%, and injury collisions dropped by 11-31%.
We need to value the most basic form of transportation as a society. Walking and rolling is fundamental. We need to elevate it in policies and resources.
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Longer term view: Seattle grew 21.3% in population since 2006, traffic volumes decreased by 3.3%, and transit ridership increased by 41.8%
30 mph street allocated for vehicle to 20 mph street re-allocated for community
Slip lane revised. Curb installed for separation. instagr.am/p/CQTdfTHNKsW/
50 homes for people and retail built on 1st Ave and Warren with no motor vehicle parking.
Our traffic laws are biased. Our transportation design "standards" are biased. "Science" used to make changes only perpetuates these systemic inequalities.
Walking and rolling on our own human power is the most basic transportation mode. We need to ensure our policies prioritizes this societal value and is reflected in our laws and public investments.
Neighborhood traffic calming greenery chicanes. Curb setback for drainage.
21% reduction on reported crashes since the default speed was reduced to 20 mph on Seattle's residential streets. 2400 miles or 60% of our street network. Data is for all non-arterial linear street network.
Bus priority and reliability...
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Should we be concerned about the quick acceleration and speeds that electric vehicles can attain with safety, especially for people walking and rolling?
Nice street usage. Bus lane, bike/freight, greenery/stormwater, and people/business spaces next to light rail station. instagr.am/p/CaFiR88JbeU/
Planning for and building streets for peak hour demand with 10+ year projected growth isn't healthy for anyone experiencing these streets, especially during majority of the non-peak period of the day.
Converted street from vehicle lane/parking to people/community space #pavement2parks
2nd Ave bike lane in Seattle was upgraded from painted lane to a two-way separated bike lanes on 9/8/14. Bike counts increased by 295% from 332 on 8/13/14 to 1,311 a year later on 8/12/15. Bike counts on 8/8/18 show 37% increase after 2nd Ave was extended and 413% from 2014.
Atmospheric river storm water calming street instagr.am/p/CWKBJjrvx6p/
Wow! Look at these 2nd Avenue trends since we installed the pbl demonstration project in 2014.
Plastic bus tire rub rail. Got idea from plastic used in skating rink when I drove a Zamboni instagr.am/p/CjDboO1LV2L/
Subsiding/investing in infrastructure for people who drive, while not investing and creating barriers for people who do not/cannot drive is not inclusive/progressive policy.
Seattle's very first bus layover protected bike lanes on Main Street and on 5th Avenue.
20 homes for people underway in Crown Hill on site of two single family homes.
Seattle added 20,000 new neighbors in 2016. Traffic volumes remained same. 2.2% vmt increase nationally and 2.9% increase in WA State. Transit ridership increased 4.8%
We updated our traffic signal policy to place people walking and rolling first. One change is to provide more time for people to cross. We are using walking speeds of 2.5 - 3 seconds rather than the 3.5 seconds in the current guidelines. bit.ly/3yFnFvf
Thank you, for the card! It's been an absolute privilege and honor to have served as your City Traffic Engineer.
2,400 miles or 60% of Seattle's streets were changed to 20 mph in 11/7/2016. 20% reduction in total number of collisions two years before (2014, 2015) compared with two years after (2017, 2018) data. 4,907 vs 3,912.
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New speed limits are in effect. Residential streets are 20 mph, arterial streets are 25 mph unless otherwise posted
Slip lane now closed and replaced with walking and parking space for scooters/bikeshare. instagr.am/p/CWYRSU_p7x0/
5 story, 229 homes for people. No vehicle parking proposed at 907 Market St in Ballard.
