Why do these marks appear alongside the gutters in so many Ashcroft streets?

The mystery has been solved by resident Ron: The grooves are the result of the evening of the road and gutter levels after damage to car suspensions.

Where in Sydney do you find street signs telling you that you must park on the footpath? In Balmain. Marvel at this regulation in Phillip and Short Streets. (See below for example.)

You won’t find it in street directories. In fact, you’ll be lucky to find it at all. But this narrow path stretches for 200 metres into the background to link Balmain’s Beattie Street with Little Beattie, Theodore, Little Theodore and Llewellyn Streets. They comprise one magic kingdom.

Why does this New Street East path in Balgowlah suddenly change its mind? Why does it then give up altogether?

Between Rowntree and Short Streets, Birchgrove, is this unnamed lane, proudly displaying the closest it gets to traffic gridlock.