Description:
This is just something I've been only making for myself for some time, but decided to make public now.

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, which I think is realistic enough.

It also includes many changes I've been making trying to portray some places more accurately, these 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)
•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, widening I-80 from Richmond to Sacramento is currently a WIP)
•Some very minor signage changes, mostly getting rid of "Carlsbad" being posted everywhere.
•Areas near Los Angeles, the SF Bay area and Sacramento more "urbanized"

Should be compatible with other map mods as long as you put them in higher priority, I've never tested though.
All map DLC probably required.

Credits:
Quaristice