The new partnership perhaps marks a new day. Uber said it believes its smart data will help city planners — and presumably more cities in the future — improve traffic planning, reduce congestion and identify streets that require improvement, like filling potholes. According to Uber, the data will be shared by ZIP Code Tabulation Area, which is the “US Census’ geographical representation of ZIP codes.” “This will help us reach our transportation goals, improve the quality of our neighborhoods and allow us to think smarter, finding more innovative and creative solutions to some of our most pressing challenges,” Boston Mayor Martin J. Walsh said in a statement Tuesday.