Google maps road names too small. Solutions? My parents can't read the road names the Google maps app, and I can't find a way round it. (Should have gone to spec savers). I have tried using Google maps via Chrome and Firefox and their increase text size features but Google Maps ignores it.

Options are flexible as I have rooted the phone and am willing to load any reasonably well tested custom ROM. 

I've tried countless map apps and they're all as hard to read, so I thought I'd ask as Google Maps has probably been hacked around with more than others
Try going into Settings / My Device / Accessibility and turning on Magnification Gestures.

A triple tap on your scree will enlarge what is there including text and then another triple tap will take you back.  While it is enlarged, you can scroll with one finger.

That's the best I've found so far.