If the car has a Resident sticker, what's the problem? It's not illegal. That's a different story if it has no sticker. If it's abandoned (unlikely), street sweeping day will resolve this.

City Hall – DR hat dieses Thema Traffic - KC (Permits) zugeordnet

Thank you for reporting your concern to City of Cambridge via Commonwealth Connect. We have reviewed the information you provided our staff and will be investigating this issue further.