TRAFFIC CONDITIONS 

  • This transportation corridor is currently in gridlock conditions during peak commuting hours
  • SR162 currently level “F” (fail) WDSOT highway peak hour rating
  • Tehaleh highway to add 1000 more cars per peak hour

COMMERCIAL TRUCK TRAFFIC ON SR162

  • Today’s commercial truck traffic consists of OVER 140 combination trucks PER HOUR
  • Currently over 1500 trucks of all types each day will negotiating roundabouts with cars (most are tractor trailer combinations)
  • Truck combinations and vehicles do not mix well in roundabouts

HIGHWAY ACCESS AND EGRESS

  • Roundabouts meter exiting traffic evenly creating little spacing in traffic downstream
    • Breaks in traffic along corridor are necessary for access and egress to SR162
    • There are 140 access/egress points along SR162 between Sumner and Orting
    • Business patrons, farmers, and residents will experience dangerous conditions entering and leaving the highway
  • Traffic signals provide significant breaks in traffic to allow safe entry and exit

SR162 / 128th St E INTERSECTION

  • A majority of southbound evening traffic will be turning left onto the Tehaleh highway, stalling all northbound SR162 traffic from Orting
  • Vehicles within a roundabout have the right-of-way restricting entry
  • The size of roundabout intersection will be much larger than a signaled intersection requiring elimination of more properties and the McMillin rural neighborhood center zoning

FOOTHILLS TRAIL

  • The Foothills Trail parallels SR162 and connects with intersections at Military Road and at 128th St. E.
  • Mixing trail users with congested roundabout traffic creates a clear danger
  • Traffic signals provide designated passage periods for trail users and pedestrians

PEDESTRIAN CROSSINGS

  • Pedestrian crossings take place just outside of roundabout intersections
  • Pedestrian crossings cause interuptions to roundabout flow
  • Safety is a large concern when drivers attention is on heavy roundabout traffic
  • Roundabout crossings use safety islands between traffic lanes dividing the crossing process into two phases
  • Traffic signals provide a dedicated time for pedestrians crossing

ROUNDABOUTS WORK...

  • When traffic flow is at normal levels (not gridlocked levels)
  • With minimal truck traffic
  • With the majority of traffic flowing in the same direction
  • When there are fewer pedestrian, jogger and bicycle crossings
  • In the SR162 application these conditions are not found
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WHY ROUNDABOUTS WILL NOT WORK
FOR SR162 CONDITIONS