The streets and parts of streets of the Coun­ty des­ig­nat­ed by ordi­nance as “through streets” are here­by declared to be through streets.  The dri­ver of a vehi­cle shall stop at the entrance to a through street and shall yield the right-of-way to oth­er vehi­cles which have entered the inter­sec­tion or which are approach­ing so close on a through street as to con­sti­tute an imme­di­ate haz­ard unless direct­ed oth­er­wise by the traf­fic officer.