In the attached screenshot, I'm about to place a via. Am I allowed to place it right there? Probably not, but I'm not quite sure because I can't tell how close it is to the neighboring traces.
While routing, I would like the traces around my cursor (or all traces) to have an extra line/shading/indicator that reflects the DRC required spacing around the trace. That way, barring some edge cases where things just barely overlap, I would always know if I can place a via there.