Using Flexi to design traffic signs. There are many ways to use Flexi to design traffic signs.
Primo PDF download:
https://www.primopdf.com/
California MUTCD Signs:
https://dot.ca.gov/programs/safety-programs/sign-specs
Federal Highway Signs:
https://mutcd.fhwa.dot.gov/shsm_interim/index.htm
Good resource for more PDF's for traffic signs:
http://www.trafficsign.us/