(n) May be created intentionally or unintentionally- two cars driving next to each other at the exact same speed, thus preventing you and other cars behind from passing. Unbelievably frustrating, especially when you have somewhere to be.
Always happens when I'm late to work.
I try to move to the right lane to prevent creating a Mexican roadblock.
A group of mexicans who walk very slow and yell out loud in spanish. Usually a group of female foreign exchange students.
These foreign exchange students are making a mexican roadblock!