Module 2 Generic Analysis for Evaluating MOSERS

In Module 1, the reader was provided a general background regarding the context of transportation and air quality planning. The concept of mobile source emissions reduction strategies is introduced, and commonly used/accepted strategies are also discussed.

This module of the guidebook focuses on generic, standardized analysis methods for the estimation of various individual mobile source emission reduction strategies (MOSERS), also sometimes termed as “actions” or “measures.” A total of 17 categories of strategies are presented in this module, several of which have different subtypes (measures) for which individual quantification approaches are discussed. All 16 of the 1990 Clean Air Act Amendments (CAAA) emission reduction measures (eligible transportation control measures [TCMs]) are included along with other categories of mobile source emission reduction strategies. The individual measures are described along with potential applications. An equation is then provided to derive the daily emission reduction of the strategy for analysis and reporting. The variables are described for each equation.

The analysis methods described herein are “off model” (i.e., computations performed outside of a travel demand model), applying generalized sketch-planning techniques. The methods are meant to assist with standardizing emissions estimation and evaluation approaches as well as documentation to aid the interagency review process.

The equations presented in this guide should be considered only as a starting point for the estimation of emissions reduction for various strategies. The results can serve as the basis for discussions between the interagency review partners and the nonattainment areas regarding mobile source emission reduction strategy use and implementation of these strategies as part of their SIP, conformity, and voluntary programs and actions. These equations can also be used by near nonattainment areas that are developing air quality plans and incorporating transportation emission reductions into their plans. Additional factors, such as the expected project life also known as the emission reduction life (ERL), and the overall cost-effectiveness of the strategy (as discussed in Module 1 of the guidebook) should also be taken into consideration. Subsequently, this guide will describe the methodology to estimate the cost effectiveness of the emissions reduction strategies and provide recommendations of ERL values for various transportation projects that were synthesized from different state agencies.