Capital letters

[Unregistered]

Hallo, I would like to ask you for a little help.
Why is there capital S in names of streets such as Queen Street, Church Street, Regent Street etc.? Is it a rule? Is it necessary to write capital S in all streets' names?
Thank you a lot.

[Anglika]

Because it is the name of the street so it becomes a "proper noun". Yes, if it is the name of the street, it needs the capital letter - Pall Mall, Regent Street, First Avenue, Park Avenue, Champs Elysees, Via Roma.