Laserfiche WebLink
4. Existing and 2025 Analyses <br />a. Existing and 2025 Corridor Vehicular Analysis <br />While many factors contribute to a road feeling congested, the two biggest factors <br />are volume, how many vehicles are using the road, and capacity, how many vehicles <br />the road can accommodate a day. Transportation professionals use these pieces of <br />information to create a ratio of volume to capacity. For example, a road with a <br />volume to capacity ratio of 1.0, where the traffic demand is nearly equal to the traffic <br />supply, will feel congested to motorists. <br />Below is a rough guide of the daily traffic volumes different types of roads can <br />accommodate based on Exhibits 16-16 and 12-39 of the Highway Capacity Manual, <br />6th Edition. If the Average Daily Traffic (ADT) volume on a roadway is below the <br />threshold, then it is considered un-congested. If the daily volume falls inside the <br />range, the road is almost congested, and if the daily volume is over the threshold <br />the road is congested. <br />• 2-Lane (one in each direction with left turn lanes at busy intersections and <br />coordinated signals), undivided street, are considered congested with a <br />volume between 8,900 to 18,300 vehicles per day. <br />• 4-Lane, undivided street (two in each direction with left turn lanes at busy <br />intersections and coordinated signals), — 18,600 to 36,800 vehicles per day. <br />• 6-Lane, divided street (three in each direction with left turn lanes at busy <br />intersections and coordinated signals), — 29,100 to 55,300 vehicles per day. <br />The above capacities represent physical capacity in ideal roadway conditions. <br />Research from UC Berkley, for example, indicates quality of life along a residential <br />street is negatively impacted when the ADT exceeds 1,000 vehicles per day. <br />Therefore, the 1,000 vehicle per day threshold is used for the capacity along <br />neighborhood two lane roads even though its physical capacity is approximately ten <br />times larger. <br />To provide an initial planning level screening, Chart 1 provides volume to capacity <br />ratios of the study corridors during each of the study years to determine if any of the <br />roadway corridors are candidates for additional through lanes. <br />Traffic Impact Study 9 <br />North Dayton Development <br />CONSULTING <br />