That depends very much upon where you are!
Here in Oz, the angling of any angled parking spaces generally guides you in which way to park, but sometimes, the parking spaces are at 90° to the traffic flow, and it's not quite so intuitive, so you can get it wrong, not often, but...

However, we've also got some places/local Govt areas where it's not quite so clear (it's often signposted somewhere obscure tho) and any angled parking must be done 'Rear to Kerb'; and other places/local Govt areas (again, usually signposted on the far end of the street or around the corner!) where you must park 'Nose to Kerb'!! If you can't see any other cars to give you a hint, so you take a punt and get it wrong, it'll very likely cost you, often as much as a couple of hundred $$, plus a dodgy 'Victims of Crime' levy (what bleedin' 'crime'!!) that can be almost $200 as well, bringing the total up close to $400!!
It was only once, but do you really need to ask me how I
know this?!
So check the cars around you, or check with the local Authorities, or failing anything else, park at your own risk!
