Common use of Intersections Clause in Contracts

Intersections. Intersections were examined using the same approach (other than geometrics) as in freeway and arterial cases. That is, the same MOVES and CAL3QHC model inputs and assumptions were used. The intersection analysis assumes six approach lanes on each leg of the intersection, with two of the approach lanes becoming left-turn lanes at the intersection. Four lanes are assumed on each departure leg. The intersection case was modeled at a grade of 2%. Table B-2, attached, shows the maximum 1-hour CO concentrations for urban and rural intersections that, with the applied 8-hour CO background level of 2.6 ppm and persistence factor of 0.7, do not produce modeled CO concentrations that could result in exceedances of the 8-hour CO NAAQS. In other words, these findings indicate that a project for an intersection with a grade of 2% or less, six approach lanes or less, and forecast approach speeds not less than 15 mph would not produce modeled concentrations that would result in exceedances of the 8-hour CO NAAQS. Any such project would be covered by this PA and would not require project-specific CO modeling to demonstrate compliance with the CO NAAQS. Conversely, for example, a project with seven approach lanes, a 3% grade and/or a 10 mph approach speed would not be covered by this PA. Note: The intersections were modeled as 90 degree intersections, that is, with roadways intersecting at right angles. Skewed intersections (those whose approaches do not intersect at right angles) are not included in PA. Similarly, highly congested intersections (where the approach speed is less than 15 mph) and intersections with five or more legs are also not included in the PA.