US 97 at Cherry Lane Road Safety Audit
KAI conducted a road safety audit (RSA) for a 1.3-mile section of the rural two-lane section of US 97 from, Meadowlark Lane-Hilltop Lane to Clark Drive. The RSA included the following activities:
- Reviewing available daily and peak hour traffic volumes, crash data, and previously implemented improvements.
- Providing training to the RSA team, explaining the Federal Highway Administration (FHWA) RSA process and outlining the activities associated with a RSA.
- Visiting the study area during the morning and afternoon peak periods, as well as during night conditions, to observe roadway-user characterisitics.
- Facilitating RSA analysis that identify and prioritize safety issues, and providing mitigations for ODOT’s consideration.
- Preparing preliminary findings presentation that was presented to key stakeholders immediately following the RSA.
- Summarizing all activities within a RSA report, which the agency can formally respond to.
The RSA team evaluated options to reduce crash frequency and severity at the intersections and along the roadway segments where safety issues were observed or identified by trends in crash data. The mitigations the RSA team asked ODOT to consider included physical changes to the intersection geometry, signs and markings, and a cross-section of US 97. Driver education and outreach was also identified for consideration based on the number of drivers that were involved in crashes during the study period and live within 25 miles of the study area.
As an outcome of the RSA, KAI prepared multiple preliminary functional layouts of proposed intersection improvements. One preferred layout was then selected and used to develop a benefit/cost (B/C) ratio for the proposed improvements. The B/C ratio was developed using ODOT’s Benefit/Cost Analysis worksheet, which takes into account Crash Reduction Factors that quantify the effectiveness of the treatments based on empirical studies.