Annual Tsukuba Marathon will be held on November 25th, between 9:30 and 14:00.

　The running route includes Higashi-Odori right in front of KEK. There will be traffic restrictions (and traffic
　jam) during the time at various places in Tsukuba. Between 9:30 and 14:00, it will be quite difficult to
　come in or go out of KEK with a car.

　See the marathon course ;http://www.tsukuba-marathon.com/regulation.html (Japanese)　

　KEK leaves open the south side exit near the soccer field (south of Gym and tennis court) for the duration.

　See a detour map; http://www-local.kek.jp/soumu/pdf/betuzu2.pdf

　If you have any reason to go out or come in to KEK, We would recommend you to do so before 9:30 or
　after 14:00.