According to the Act,  “through highway” means a highway or part of a highway at the entrances to which stop signs are erected under this Act;

Generally when people say through street it means a street along which the traffic has the right of way over vehicles entering or crossing at intersections.

Thru3

 

In Context – ICBC Crash Example: 

http://www.icbc.com/claims/determine-fault/Documents/collide.pdf : ok2