| State: | KS |
| Maint: | KDOT |
| Type: | KS |
| Route: | 12 |
| Map Custom: | yes |
| Map Notes: | Former K-12 in red, former K-12 Spur in blue |
| Established: | 1985 |
| Decommissioned: | 1987 |
| Direction A: | West |
| Terminus A: | near Bonner Springs |
| Junction: | near Lenexa in Mission in Roeland Park in Kansas City |
| Direction B: | East |
| Terminus B: | Missouri state line in Kansas City |
| Previous Type: | KS |
| Previous Route: | 10 |
| Next Type: | KS |
| Next Route: | 13 |
K-12 was a state highway in the U.S. state of Kansas, created in the mid-1980s. Its alignment was changed during its existence.
K-12 was commissioned when the first section of the K-10 freeway was completed from K-7 in Olathe, Kansas to I-435 in Lenexa, Kansas. K-10, at the time, overlapped K-7 from K-12's western terminus in Olathe north to Shawnee Mission Parkway.[1]
When the K-10 freeway segment from Lawrence to Olathe was completed, K-10 was signed for the entire length (both sections) of the expressway. At this time, K-12 was realigned north to replace the former K-10 alignment along the Shawnee Mission Parkway. It followed the parkway from K-7 in Shawnee, then turned north on Merriam Drive in Merriam, which follows into Kansas City, Kansas. Merriam Lane turns into Southwest Boulevard near US-169, and K-12 ended not far east at the Missouri state line.[2]
Since K-12 existed entirely within the city limits of the cities it traverses, it was turned back to the cities in 1987 according to KDOT policy.
Major junctions as listed shortly before K-12 was decommissioned in 1987.[3]
| State: | KS |
| Type: | KS-Spur |
| Route: | 12 |
| Established: | 1984 |
| Decommissioned: | 1987 |
| Length Mi: | .376 |
K-12 Spur was a 0.376-longNaN-long spur route that ran from K-12 east to Interstate 35 (I-35). Originally K-10 Spur, it was changed to K-12 Spur when the Shawnee Mission Parkway and Merriam Lane were changed from K-10 to K-12. K-12 Spur was withdrawn in 1987 along with K-12 itself.[4]