Upgrading streetlights; sounds like a good idea. Saving money; also a good idea. Pollution sensors; I like that one a lot. Could be useful in fixing bad traffic patterns that stall drivers overlong in certain areas.

Installing video, still cameras, visual tracking of any kind, audio recording capability - No. 

Not just no, but HELL no. Enough loss of privacy already. There's enough cameras out there now for every person on the freakin' planet to have their own selfie 24-7. Big Brother needs to be on a short leash - hopefully one so short and tight he's gasping for air.