H4 Service Alert: Expect delays in both directions on Route H4 at Columbia Rd NW & 14th St because of a route blockage. Check your bus location by visiting https://buseta.wmata.com/#H4 H4 Service Alert: Expect delays in both directions on Route H4 at Columbia Rd NW & 14th St because of a route blockage. Check your bus location by visiting https://buseta.wmata.com/#H4