A new set of 12 parking signs with a sign post, found under Decor/Misc. Decor and all cost 0.
If you've downloaded "33 street names for Bridgeport and CAW" the sign post is the same, so delete the new one, so you don't have 2 duplicate sign posts.
The cheat code "moveobjects on" is needed so you can place the parking signs on the sign posts.
You need Ambitions or a later expansion pack for these to show up.
Various parking signs - blue in white with sign post (MediaFire)