I also live in Texas and know my citys' sign ordinance. I also understand its a cost doing business and expect to loose a few.
When I was a young pup putting out signs no one was doing it so I had a niche. The niche is the key. I would hardly put them out on a highway due to not my niche. Most people that travel highways are not from the local area or live in my niche area.
The other thing I realized is if I did not put signs out my phone or drive by traffic fell off. I was selling new homes so I had a specific purpose. Adverting "we buy houses" is a niche and I would recommend using your niche.
Bottom line suggestion is know your market, place signs where you farm(homes that are 20-60yrs old) in neighborhoods, map them out on paper and drive what you put out to see how they feel. Putting them in neighborhoods will not be picked up as often cause cities dont have the staff to manage like the highway dept. does.
To me each sign was worth $1,000 so I always kept 50 with me. Good luck.
Barry in Tx.