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National Capital Region Transportation Planning Board Report

Regional Twelve-Year Bottleneck Analysis, December 2, 2022 – “Bottom Line Up Front: results of staff’s analyses show a complex set of occurrences, but with one persistent top-ranked bottleneck. Today’s presentation will look at: The PDA Suite bottleneck tool methodology, how options within the tool cause variations in results, and caveats; Observations on how choosing alternative tool options would impact results; Results from analyzing the twelve years available in the PDA database (2010 through 2021) using the same (staff- recommended) tool options as used for the 2022 CMP Technical Report; Observations on why bottleneck rankings change over time..”

The region’s top 10 worst local bottlenecks (ranked by impact and delay):

  1. I-95 S @ VA-123/Exit 160 (Woodbridge): It’s backed up on average for eight hours every day.
  2. I-95 N @ VA-123/Exit 160 (Occoquan/Lake Ridge)
  3. DC-295 S @ East Capitol St
  4. Balt-Wash Pkwy N @ Powder Mill Rd
  5. I-95 N @ VA-617/Backlick Rd/Exit 167
  6. US-301 S @ Mckendree Rd/Cedarville Rd
  7. I-495 Inner Loop @ I-270-Spur
  8. I-66 W @ VA-234/VA-234-BR/Exit 47 (Manassas)
  9. I-270 S @ MD-109/Exit 22 (​​Old Hundred Road – Hyattstown, Barnesville)
  10.  I-270 N @ MD-109/Exit 22 (​​Old Hundred Road – Hyattstown, Barnesville)

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