That's quite an assertion – but it's false.
Traffic engineers have already modeled the design and found that a 2-lane Franklin Street will function just as well as the poorly-designed 4-lane version, which wastes a dozen acres of valuable downtown real estate.
If you at
MaineDOT's new traffic counts database the AADT (average daily traffic) for Franklin NW of Cumberland Ave. has been declining, to the point where it's now under the MaineDOT's formal thresholds for a 3-lane road diet.
Combined, these volumes fall comfortably under MaineDOT's 20K-25K AADT threshold for consideration of a 4-lane to 3-lane road diet (
https://www.maine.gov/mdot/edi/docs/RoadDietGuidelines.pdf).
In fact, Franklin's combined two-way AADT south of Fox/Somerset is comparable to Washington Avenue between Presumpscot and Ocean (
19,020 AADT) and outer Congress between Frost and Stevens (
19,340 AADT in 2019), places where the city has successfully implemented 4-to-3 lane road diets with no impacs to traffic.
Traffic is caused by cars, and the best way to reduce traffic is to make more room for housing downtown to accommodate more car-free households. We've seen this on Franklin Street: as more development has happened on India Street and the eastern waterfront, traffic on Franklin has actually gone down over the past 20 years.
It's fine if some people feel like
@TC_zoid and are too delicate to walk outside in the winter – but there are plenty of places for those folks in the suburbs. The vast majority of people are perfectly fine being outside in colder weather – and if we build more housing for car-free households in the city, instead of forcing them to buy cars and commute in from places like Buxton and Windham, then we'll have less traffic not only in Portland but across the entire region.