Elevation of 12,183 feet 3713 m is what average route?
CREATE TABLE "colorado_highway_summits_not_on_a_pass" (
  "rank" real,
  "highway" text,
  "elevation" text,
  "surface" text,
  "route" real
);
SELECT AVG("route") FROM "colorado_highway_summits_not_on_a_pass" WHERE "elevation"='12,183 feet 3713 m';