That happened to us, too! Not to worry: change can be tough, and we have to comply with existing municipal rules and regulations.
In our case, we found that sign de-installation let us engage in a really exciting conversation with the city about how Walk Raleigh signs could be incorporated into the community.
Our advice? Be open to a dialogue with your city -- and "ask for forgiveness" like we did. We also urge our users to check out local sign and public posting codes before implementing a Walk [Your City] campaign to better understand what might happen in response to sign installation. If you study the local code and ordinances well, you can find out how your signs could be temporarily authorized!