I'm taking a look through Streets of Mayhem at the moment and I noticed the instructions for placing Street Signs says to glue them to the ground tiles and fold them over for storage. I immediately wonder if it becomes hard to make these signs stand up straight after a while. Is this an issue and if so, what can be done about it?

One of the most popular solutions is to glue the sign bases to a weight, like a penny. Once you paint the penny to match the street (or glue a bit of street tile to it first), it blends right in.

The one drawback with this is that they're easily knocked over. However, there's far easier storage, and you can remove them if they get in the way of the miniatures.

Hope this helps!