This mod greatly increases traffic density in major urban areas, these areas being defined as the San Diego - Los Angeles corridor, San Francisco bay area, Sacramento, Reno, Las Vegas, Phoenix, Tucson, Albuquerque, Portland and Seattle; traffic elsewhere is kept to vanilla levels
Changes detailed below:
•I-5 widened to 2x4 from San Diego to just north of Los Angeles (originally a mix of 2x2 and 2x3)
•I-5 narrowed to 2x2 from Sacramento to Redding (originally 2x3)
•I-10 widened to 2x4 from Los Angeles to Palm Springs (originally 2x3 and 2x2)
•I-10 widened to 2x4 In the Phoenix region (originally 2x3 and 2x2)
•US 101 widened to 2x4 in the Bay Area and near Los Angeles (originally 2x2 and 2x3 respectively)
•I-580 (the California one) widened to 2x4 from the I-5 junction to Richmond (originally 2x2)
•I-80 widened to 2x4 from Richmond to SR37 and 2x3 up to Sacramento (originally 2x2)
•CA-99 widened to 2x3 near Bakersfield and 2x4 in Bakersfield (originally 2x2)
•Signage overhaul in California, including US-101 and I-5 south of San Francisco and I-15.
•Areas near Los Angeles, the SF Bay area and Sacramento more "urbanized"
•Downtown Los Angeles remodeled.
Changes made in Colorado sectors so I believe it'll require all current map DLC except for Idaho, since SCS fixed the Sandpoint spawn rate by themselves. Also I somehow missed the sectors with the US-101 in my last update so the Lite Versions have been reuploaded with them (they're considered part of the "SoCal" area).
Link 2 - Reforma Compatibility Patch