What is the Milepost of the Twin Tunnel #1 North?
CREATE TABLE "tunnels" (
  "milepost" real,
  "name_of_the_tunnel" text,
  "length" text,
  "maximum_height" text,
  "minimum_height" text
);
SELECT COUNT("milepost") FROM "tunnels" WHERE "name_of_the_tunnel"='twin tunnel #1 north';