tachophobia 

The fear of high speeds. Roller Coasters, Bungjee jumping, etc.

Not to be confused with Tacophobia, which is something I made up.

A person with severe Tachophobia can be afraid to ride in a car.

tachophobia by Someone you will never know. Ever. May 1, 2006

Tacophobia 

The fear of pregnant women eating tacos at high speeds. Derived from the words tocophobia (the fear of pregnant women), tachopobia (the fear of high speeds, and taco.

After watching the Mexican version of Juno on a crashing airplane, Tyler got an acute case of Tacophobia, as well as an acute case of death.

Tacophobia by originallangstas January 12, 2009