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St. Anthony 2040 Comprehensive Plan Chapter 6: Transportation <br /> <br />73 <br /> <br />Existing Roadway Capacity and Safety <br />Roadway capacity and roadway safety are two key indicators of how well the <br />roadway system is meeting the City’s transportation needs. The sections below <br />provide information to better understand capacity and safety issues within St. <br />Anthony Village. <br />Existing Roadway Capacity <br />A roadway’s capacity indicates how many vehicles may use a roadway before it <br />experiences congestion. Capacity is largely dependent upon the number of lanes. <br />FIGURE 6-4 below lists planning-level thresholds that indicate a roadway’s capacity. <br />Additional variation (more or less capacity) on an individual segment is influenced <br />by a number of factors including: amount of access, type of access, peak hour <br />percent of traffic, directional split of traffic, truck percent, opportunities to pass, and <br />amount of turning traffic, the availability of dedicated turn lanes, parking availability, <br />intersection spacing, signal timing and a variety of other factors. <br />FIGURE 6-4: PLANNING-LEVEL URBAN ROADWAY CAPACITIES <br />Facility Type <br />Daily Two-way Volume <br />Lower <br />Threshold <br />Higher <br />Threshold <br />Arterials Two-lane Undivided 10,000 12,000 <br />Two-lane Divided or Three-lane <br />Divided 15,000 17,000 <br />Four-lane Undivided 18,000 22,000 <br />Four-lane Divided or Five-lane <br />Undivided 28,000 32,000 <br />Freeways Four-lane Freeway 60,000 80,000 <br />Six-lane Freeway 90,000 120,000 <br />Eight-lane Freeway or Higher <br />Calculated on a <br />segment-by-segment basis <br />