TH 23CSAH 7 Road Safety Audit - PowerPoint PPT Presentation

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TH 23CSAH 7 Road Safety Audit

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One fatal crash and 11 crashes involving injuries ... Undersized signing for expressway intersection conditions ... Short-term improvements are only temporary solution ... – PowerPoint PPT presentation

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Title: TH 23CSAH 7 Road Safety Audit


1
TH 23/CSAH 7 Road Safety Audit
2
TH 23/CSAH 7 Road Safety Audit
  • Background
  • Data Collection and Review
  • Field Review Observations
  • Potential Mitigation Measures

3
Background
  • Purpose and Need for Road Safety Audit
  • Intersection identified by City as safety problem
    location
  • Recent fatal bike crash
  • Road safety audit can identify potential safety
    solutions
  • Pending Development north of TH 23
  • Road Safety Audit Team
  • Five Mn/DOT experts
  • Minnesota State Patrol officer
  • SEH traffic engineer

4
Data Collection and Review
  • Meeting with District 8 and Other Stakeholders
  • Intersection Geometry and Traffic Control
  • 4-lane expressway intersecting 2-lane road
  • 55 mph speed limit on TH 23
  • 40 mph speed limit on CSAH 7 north of TH 23 and
    55 mph speed limit on CSAH 7 south of TH 23
  • Right and left turn lanes on TH 23 right turn
    lanes on CSAH 7
  • Narrow median crossover (about 42 feet from edge
    to edge)
  • TH 23 is uncontrolled
  • Stop sign control for CSAH 7 and yield sign
    control for median crossover
  • Bike crossing across east leg of intersection

5
Data Collection and Review
  • Traffic Volumes
  • 5,800 to 5,900 veh./day on TH 23
  • 3450 to 740 veh./day on CSAH 7
  • 2,200 veh./day on CSAH 7 north of Country Club
    Drive
  • 2,000 veh./day on Country Club Drive
  • Future traffic increase due to anticipated
    residential development north of TH 23
  • Intersection does not currently meet MMUTCD
    signal warrants

6
Data Collection and Review
  • Crash Data
  • 17 crashes in approximately five year period
  • One fatal crash and 11 crashes involving injuries
  • Intersection crash rate is four times the
    statewide average rate
  • 14 crashes were right angle type
  • 12 crashes involved vehicles pulling away from
    median crossover

7
Field Review Observations
8
Field Review Observations
  • Geometric Design and Lighting
  • Curve in CSAH 7 north of TH 23 and curve in CSAH
    7 north of Country Club Drive
  • Jog in CSAH 7 north of TH 23
  • Vehicles waiting in median left turn lanes can
    limit sight distance for other traffic
  • Limited storage space for vehicles waiting in the
    median crossover
  • Radii in NW and SE corners is tight for large
    trucks
  • No end treatment for bridge railings on CSAH 7
    bridge south of TH 23
  • Existing street lighting

9
Field Review Observations
  • Signing and Pavement Markings
  • Undersized signing for expressway intersection
    conditions
  • SB STOP sign and median DO NOT ENTER signs
    mounted too low
  • ONE WAY sign obscures shape of YIELD signs on
    median
  • NB CSAH 7 STOP AHEAD sign too small
  • Good route marker/directional signing identifies
    intersection
  • Approaches have centerline, edge line, and lane
    line markings
  • No pavement markings in median crossover area
  • No yield line markings
  • BIKE CROSSING signs are 30x30
  • Delineator color wrong on curves

10
Field Review Observations
  • Other Observations
  • No off-road pedestrian or bike facilities
  • No development in any corners of intersection

11
Potential Mitigation Measures
  • General
  • Grouped into short-term and long-term
    improvements
  • Short-term measures not guaranteed to be
    successful

12
Potential Mitigation Measures
  • Short-Term Improvements
  • Upgrade signing to meet current expressway
    intersection signing practices
  • Increase size of NB STOP AHEAD sign on CSAH 7
  • Add BIKE ROUTE sign with LEFT ARROW sign on EB TH
    23
  • Increase size of BIKE CROSSING signs to 36x36
  • Add flashers to BIKE CROSSING signs
  • Change delineators on curves
  • Add rumble strips along TH 23 edge lines
  • Mark yield lines in the median crossover
  • Reconstruct median ends and add defined pathway
    for bike crossing
  • Add HAWK signal for bike crossing
  • Increase corner radius in NW and SE corners of
    intersection to accommodate large trucks
  • Add crashworthy end treatment to CSAH 7 bridge
    railings

13
Potential Mitigation Measures
  • Long-Term Improvements
  • Change intersection to grade-separated
    interchange
  • Reconfigure intersection to provide offset left
    turn lanes in median area
  • Add free right and acceleration lane for SB CSAH
    7 movement
  • Reconfigure intersection to ¾ access intersection
  • Reconstruct and realign CSAH 7/Country Club Drive
    intersection

14
Potential Mitigation Measures
  • Other Considerations
  • Provide sidewalks or trails along roadways
  • Form Safe Communities Coalition

15
Summary
  • Alternative choices of improvements provided and
    need more detailed evaluation by District 8 staff
  • Short-term improvements are only temporary
    solution
  • Permanent solution can only be achieved through
    long-term improvement
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