What are the best sources for highway icons? Particularly those for specific routes but generic/blanks ones would do.
wikimedia
The AARoads Shield Generator (https://aaroads.com/shields/generator.php) would be a good candidate but it appears to be broken. Given that it's fairly easy to generate shields with SVG templates these days, perhaps someone would consider rewriting it?
Speaking of SVGs, would it be uncouth to post SVG code here for everyone's benefit? I'm probably going to end up with a few SVG templates as I poach them and remove numbers as needed.
SVG templates already exist, in both blank and fill-able forms: https://commons.wikimedia.org/wiki/Category:Diagrams_of_state_highway_route_markers_of_the_United_States
This here is my go-to. They just made a major update, it appears.
https://shields-up.net/
I ended up writing a shield generator using the SVG templates. I'm not promoting it yet because it's not "ready for prime time."