Each proposed development that submits a Transportation Impact Analysis will be required to contribute a proportionate share of the costs of the final improvements to the transportation system that will be required as a result of the cumulative impact that various developments combined will have on the intersections.

Proposed developments must contribute their proportionate share or contribution for all collector and collector, arterial and arterial, or collector and arterial intersections, and intersections identified on the TSP list for an intersection improvement.

Exception: Intersections within the study area that are included in the City’s Capital Improvement Plan or that are on the most current SDC fiscally constrained project list are exempt from proportionate share contribution.

The City may use the proportionate share contributions for multi-modal improvements on the transportation corridor and surrounding system if the improvement project benefits safety and operations and helps to reduce congestion.

Proportionate share calculations must be submitted with the Transportation Impact Analysis. Proportionate share calculations are calculated based on the ratio of development trips to growth trips for the anticipated cost of the full Transportation System Plan intersection infrastructure. The formula is provided below:

Net new trips are the total entering trips that are proposed to be added to the study area intersection by the proposed development. [Ord. NS-2463, 2023; Ord. NS-2423, 2021; Ord. NS-2362, 2020; Ord. NS-2263, 2016]