News, Analysis and Opinion for the Informed Boulder Resident
Thursday February 21st 2019

Support the Blue Line

Subscribe to the Blue Line

That's what she said

city council transportation energy municipalization xcel housing urban planning april fools bicycles climate action election 2011 density boulder county open space affordable housing election agriculture renewables CU local food climate change election 2013 development jefferson parkway youth pedestrian election 2015 preservation Rocky Flats election 2017 recreation BVSD immigration mountain bikes boards and commissions decarbonization transit urban design GMOs fracking plan boulder farming fires wildlife colorado politics downtown architecture smart regs new era colorado plutonium natural gas journalism homeless planning board transit village parking commuting ghgs radioactive waste land use taxes rental height limits coal historic preservation april fools 2015 walkability historic district diversity energy efficiency Neighborhoods population growth flood students growth North Boulder gardens arts education election 2010 election 2018 solar bus water supply zoning University Hill nutrition RTD bike lane electric utility library safety sprawl groundwater water quality election 2012 affairs of the heart april fools 2016 renewable energy organic flood plain planning reserve mayor zero waste blue line wetlands county commissioners hogan-pancost politics electric vehicle hazardous waste transportation master plan obama longmont ballot right-sizing street design colorado legislature solar panels PV recycling golden comprehensive plan climate smart loan diagonal plaza Mapleton campaign finance bears flood mitigation conservation easement epa food boulder junction congestion pesticide road diet drought election 2016 planning inequality bus rapid transit flooding oil daily camera climate change deniers automobile PUC children ecocycle community cycles BVCP Newlands community league of women voters wind power public health ken wilson david miller sam weaver mlk crime civil rights boulder creek west tsa contamination city attorney al bartlett public spaces green points technology EV Orchard Grove marijuana Whittier arizona

FHWA | Road Diet Informational Guide


By

“Four-lane undivided highways have a history of relatively high crash rates as traffic volumes increase and as the inside lane is shared by higher-speed through traffic and left-turning vehicles. One option for addressing this safety concern is a ‘Road Diet’. A Road Diet involves converting an existing four-lane undivided roadway segment to a three-lane segment consisting of two through lanes and a center two-way left-turn lane. The reduction of lanes allows the roadway cross section to be reallocated for other uses such as bike lanes, pedestrian refuge islands, transit stops, or parking.

“Benefits of Road Diet installations may include:

  • An overall crash reduction of 19 to 47 percent.
  • Reduction of rear-end and left-turn crashes through the use of a dedicated left-turn lane.
  • Fewer lanes for pedestrians to cross and an opportunity to install pedestrian refuge islands.
  • The opportunity to install bicycle lanes when the cross-section width is reallocated.
  • Reduced right-angle crashes as side street motorists must cross only three lanes of traffic instead of four.
  • Traffic calming and reduced speed differential, which can decrease the number of crashes and reduce the severity of crashes if they occur.
  • The opportunity to allocate the ‘leftover’ roadway width for other purposes, such as on-street parking or transit stops.
  • Encouraging a more community-focused, ‘Complete Streets’ environment.
  • Simplifying road scanning and gap selection for motorists (especially older and younger drivers) making left turns from or onto the mainline.”

Read the entire guide at the Federal Highway Administration Safety page: rdig.pdf.

Rate this article: 1 Star2 Stars3 Stars4 Stars5 Stars (1 votes, average: 5.00 out of 5)
Loading...

What do you think? Leave a comment!

You must be logged in to post a comment.