Federal regulations allow MPOs to group or combine
projects that are not considered to be of appropriate
scale for individual listing. Such projects may
be grouped by function, work type or geographical
area and must be consistent with the exempt project
classification contained in EPA’s “Transportation
Conformity Regulations (40 CFR part 93).” Such
grouped projects are often referred to as “Lump
Sum Projects Listings.” Once grouped, the
MPO is required to maintain outside of the TIP,
a detail list of the projects contained in each
group.