A megahertz is one million (or 106) hertz.
See hertz, kilohertz (one thousand hertz), gigahertz[?] (109 hertz), terahertz[?] (1012 hertz), and petahertz[?] (1015 hertz).
... because the narrow streets make it near-impossible to overtake on the track. However, its history and the spectacle of the event are likely to guarantee the event's ...