Hi, 
maybe I'll take a look at some point, need to check the sign.

But if the comment is correct, then the "best practice" is really hard to come up with.

I guess
motor_vehicle=private
and maybe
motor_vehicle:conditional=yes @ delivery

But I don't know about delivery. We don't have such thing as a "service transport" in our law and it may be hard to interpret if it means only street cleaning and maintenance, or cars for businesses there and if it includes things like Bolt Food. 

Maybe I'll ask transport department after I take a look at the sign.

But anyway, even if Bolt Food is allowed, then 
motor_vehicle:conditional=yes @ delivery
is quite a corner case and may not be recognized by whatever routing you are using.

Also, there might be a bollard from Kopli side, which should be added then, needs checking.
