CREATE TABLE "northern_ireland" (
  "county" text,
  "tunnel" text,
  "type" text,
  "length_imperial" text,
  "date_of_opening" text
);

Question: What Tunnel has an Imperial Length of 307 yd?
SQL: SELECT "tunnel" FROM "northern_ireland" WHERE "length_imperial"='307 yd';

Question: What Type of Tunnel is the Downhill Tunnel?
SQL: SELECT "type" FROM "northern_ireland" WHERE "tunnel"='downhill';