Item B: West 11th Transportation Corridor Study

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Additional benefits can be realized if the left-turn phasing is modified along the corridor at selected locations. Modifying the existing doghouse signal heads to four-section flashing yellow left turn heads will allow lead/lag phasing operations without the left-turn trap (not possible with the existing doghouse head). Traffic Operations Existing and future short-term (2013) intersection operations were analyzed to determine where operating standards are either currently not met or would likely not be met in the near future. Focus is on intersections because they are the controlling bottlenecks of traffic flow and the ability of a roadway system to carry traffic efficiently is nearly always diminished in their vicinity. Multiple intersections that will exceed operating standards are identified in this report along with recommended improvements (see Chapter 8: Short Term Operational Improvements). Recommended Improvements Intersection improvements can be a relatively low cost method for improving transportation system capacity. More detailed consideration, including estimating costs, was given to the following four locations (which are listed by agency jurisdiction): City of Eugene th West 11 Avenue/Bailey Hill Road: Add a northbound right-turn lane. th West 11 Avenue/Seneca Road: Add a westbound right-turn lane. ODOT th th West 11 Avenue/Terry Street: Widen West 11 Avenue for one-quarter mile west of Terry Street to provide two westbound travel lanes, convert the westbound right-turn lane to a through- right, and restripe the southbound through/right-turn lane to include a shared left- turn/through/right-turn lane with a split-phased signal in the northbound and southbound directions. th West 11 Avenue/Beltline Road: Construct an additional southbound approach lane to accommodate dual left-turn lanes (14 feet and 12 feet wide) and one southbound right-turn lane (12 feet wide). The signal should be timed to have a southbound right-turn overlap phase. Construct an additional eastbound left-turn lane to provide dual eastbound left-turn lanes. Extend the westbound right-turn lane to provide additional storage capacity. Funding Considerations The City of Eugene may consider implementing supplemental system development charges (SSDCs) to start collecting funds proportionately from developments in the area to assist in funding the short-term improvements. The city could utilize the short-term growth and improvement cost estimates to determine cost per trip allocations for cost share calculations. This funding mechanism has been used successfully by other jurisdictions in Oregon to help fund needed infrastructure improvements. The improvements for the intersections under state jurisdiction should be coordinated with ODOT. A similar funding mechanism could be considered for the state intersections, with funds being collected by city staff. th West 11 Avenue Corridor Study September 4, 2009 City of Eugene P07265-003-000 3