Raised medians manages access and improves safety. Also,provides pedestrian refuge.

Raised Median

Criteria

  • Arterials with traffic volume of > 18,000 and future volume projected at > 24,000 vehicles per day
  • High turning volumes
  • High crash rates
  • Number of driveways
  • Pedestrian crossings
 

Benefits

Raised medians concentrate left turn movements and provide the following benefits.

  • Improve traffic flow
  • Increase business and employment in some areas when compared to congested roadways
  • Beautification

Urban / Suburban Areas

Raised medians provide the following benefits.

  • Greater vehicle and pedestrian safety
  • Pedestrian refuge
  • Improve levels of service
  • Reduce turning conflicts

 

Flush medians use “two-way left-turn lane” (TWLTL) in urban /suburban areas.

Flush Median

Criteria

  • Design speeds of 45 mph or less
  • Current traffic volume of < 18,000 and future traffic volume projected at < 24,000 vehicles per day

Research Data

  • Capacity increased by 30%
  • Delay decreased by 30%
  • Total crashes were reduced 35%

Depressed grass medians allow  higher speeds on state “through” routes

Depressed Median

Criteria

  • Typically rural setting
  • Higher speeds, with greater recovery area
  • Most effective for reducing crashes

Benefits

  • Provide greater safety at high speeds
  • Provide a larger recovery zone
  • Reduce crashes and improve survival rates
  • Provide landscaping opportunities

Rates for vehicle crashes involving pedestrians on urban arterials are 5 times higher on undivided roads than on roadways with medians. Pedestrian-vehicle crash rates were higher at mid-block on undivided highways than at mid-block in raised median sections.

Raised Medians

  • Provide pedestrians refuge from traffic
  • Allow safer crossings in areas of pedestrian activity
  • Protect pedestrians by minimizing vehicle left turn movements

Medians convert a two-way movement into two one-way movement. Improvement is safer for pedestrians. “Look left and cross, then …look right and cross.”

 

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