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Road Diet DTA Methodology

Road Diet DTA Methodology. PM 5-hr trip tables (2pm-7pm) were transposed to represent reverse directionality on network (akin to AM assignment) Technical team ( CoP , Metro, ODOT, DKS) worked together to evaluate possible reduction of trip tables to match AM profile

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Road Diet DTA Methodology

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  1. Road Diet DTA Methodology • PM 5-hr trip tables (2pm-7pm) were transposed to represent reverse directionality on network (akin to AM assignment) • Technical team (CoP, Metro, ODOT, DKS) worked together to evaluate possible reduction of trip tables to match AM profile • 5% reduction in transposed PM trip tables recommended • Calibration measurements (volumes vs. counts on Barbur) show that 100% transposed trip tables better match against counts than 95% trip tables • Used 100% transposed trip tables • 2010 existing conditions and 2035 future conditions studied • All results represent transposed PM trip tables  AM directionality

  2. Road Diet DTA Caveats • This model used 2010 Base and 2035 Low Build trip tables for all Road Diet model runs • Does not account for following: • Time-of-day shifts • Trip shift (e.g., not taking discretionary trips) • Mode shift (e.g., transit, non-motorized) • Signals not re-optimized for Road Diet…no additional ‘mitigation’ for traffic impacts • Transposed PM trip tables not a perfect correlation to AM trip tables

  3. Peaking profile 3

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