Investors won't be interested in a one-shot project. They'd be interested if the company can grow big, either by selling systems to other cities, or expanding into related businesses. So figure out whether or not that's possible.
Most cities are terrible customers. They make decisions slowly and often impose painful requirements on suppliers. They're wary of anything that could fail publicly, because the media loves to show failures and blame it on the city government.
Another way that cities are bad customers is by not actually using things they buy. They might buy your product and then not get around to hiring anyone to operate it. Even though you got paid, you won't be able to iterate and improve the product.
City purchases are generally public records, so you should look for similar products the city has bought and go talk to people in the company that made it for advice and connections.
Most cities are terrible customers. They make decisions slowly and often impose painful requirements on suppliers. They're wary of anything that could fail publicly, because the media loves to show failures and blame it on the city government.
Another way that cities are bad customers is by not actually using things they buy. They might buy your product and then not get around to hiring anyone to operate it. Even though you got paid, you won't be able to iterate and improve the product.
City purchases are generally public records, so you should look for similar products the city has bought and go talk to people in the company that made it for advice and connections.