Proper noun
Carmageddon
- (US, California) The anticipated traffic jam resulting from closing a major freeway.
2013, Susan Bregman, Kari Edison Watkins, Best Practices for Transportation Agency Use of Social Media, →ISBN, page 120:Outreach for Carmageddon earned Metro and Caltrans a Project of the Year award from the California Transportation Foundation, but the key mark of success had always been removing traffic from the Sepulveda Pass that July weekend.