Given that roads are generally built by political entities, avoidance of politics cannot be completely accomplished here.
If one wants to discuss the politics behind a certain decision to build or not build a project -- see any of the Breezewood threads -- then that's generally acceptable.
But a "Trump Bad, Hillary Good" discussion would be shut down pretty quickly. And a "Trump Good, Hillary Bad" discussion would be shut down even quicker, given what I've observed of the political leanings of some of the powers that be.