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Lane Width Reallocations Based on 5-Year Crash Data. Richard C. Moeur, PE ADOT Traffic Design March 2007 edition. Flagstaff. Business Route 40 is primary east-west arterial street in Flagstaff Also known as “Route 66” Was US 66 from 1920s-1980s Currently signed as Historic US 66

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lane width reallocations based on 5 year crash data

Lane Width ReallocationsBased on 5-Year Crash Data

Richard C. Moeur, PE

ADOT Traffic Design

March 2007 edition

flagstaff
Flagstaff
  • Business Route 40 is primary east-west arterial street in Flagstaff
  • Also known as “Route 66”
    • Was US 66 from 1920s-1980s
    • Currently signed as Historic US 66
  • Currently owned & managed by ADOT
  • Will transfer to City of Flagstaff in future
crash analysis
Crash Analysis
  • Part of design exception analysis for two B-40 paving projects in Flagstaff
  • Looked at all reported crashes from MP 195 - 200
    • Jan 00 - Dec 04 (5 years)
  • Bike-MV crashes make up nearly 25% of all reported crashes in corridor
    • (75 out of 300+ total crashes)
findings
Findings
  • 60% of bicycle-motor vehicle crashes involved wrong-way bicyclists
    • 50% of crashes involved wrong-way sidewalk or path riding
  • 63% of bike-MV crashes involved sidewalk or path bicyclists
      • 34% on north sidewalk BNSF OP - E Flg
      • 10% on south side path downtown - E Flg
      • 19% on other sidewalks (Milton, W 66)
findings1
Findings
  • Only 1 crash involved an overtaking motorist colliding with a cyclist traveling in the roadway
      • Motorist cited for 28-735
  • Only 1 fatal crash
    • at B-40 onramp at East Flag TI
  • Bicyclist at fault in 72% of crashes
    • Only 15% resulting in citation
hot spots
Hot Spots
  • 6bicycle-MV crashes at Milton / B-40
    • 83% wrong way riding on sidewalk
  • 6bicycle-MV crashes at US 180 / B-40
    • 83% sidewalk riding
  • 8bicycle-MV crashes at Enterprise / B-40
    • 100% non-roadway cyclists
      • 62% involving pathway users (south side)
    • 75% involved wrong way riding
critical issues
Critical Issues
  • Wrong-way riding
    • Bicyclist approaches conflict points from unseen and unexpected direction
  • Sidewalk / path operation
    • Perceived as safer, but has higher crash risk
    • Bicyclists enter intersections unexpectedly
critical issues1
Critical Issues
  • Low apparent percentage of bicyclists riding in roadway
    • Outside lane widths not sharable per 28-815
      • Drivers must change lanes to pass
      • Bicyclists may be uncomfortable occupying lane
      • Relatively high traffic volumes
    • Speeds consistent with urban arterial
      • apx. 40 MPH through much of corridor
lane widths
Lane Widths
  • AASHTO Green Book & ADOT Roadway Design Guide allow wide variety of lane widths
  • 12 ft is ‘basic’ width
    • But is “worst-case” situation for sharing
    • Looks sharable, but really isn’t
  • 10’ - 11’ are fully endorsed by AASHTO
  • 14’ is minimum sharable width
    • ARS 28-735 requires 3 ft passing distance for bicyclists
recommendations
Recommendations
  • Discourage wrong-way riding
  • Encourage on-street riding
recommendations1
Recommendations
  • 60 ft roadway
      • (plus 2’ curb & gutter each side)
  • Old lane widths
      • 2 x 12’ lanes each direction + 12’ TWLTL
  • Revised lane widths
      • 10’ TWLTL
      • 11’ inside travel lanes
      • 14’ sharable outside travel lanes
adot bike policy
ADOT Bike Policy
  • ADOT will allow bike lanes or other facilities on state highways
  • However, ADOT requires local agency responsibility for bike-specific signs & markings
  • No agreement reached on B-40 (yet…?)
questions
Questions?
  • Presentation can be downloaded from:
  • http://www.richardcmoeur.com/pres/b40flag.ppt