"Because of the need for the digital receiver to sample the transmitted signal at a very precise time, the digital receiver cannot be in motion... motion would cause a slight change in the timing of the received signal due to the Doppler effect; this would make accurate sampling of 8-VBS modulation impossible. Enhanced 8-VBS or E8-VBS seeks to overcome this limitation of motion by broadcasting a more robust signal at a lower data rate." http://en.wikipedia.org/wiki/Talk:ATSC_Standards#Why_doesn.27t_ATSC_work_in_moving_vehicles.3F
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"Because of the need for the digital receiver to sample the transmitted signal at a very precise time, the digital receiver cannot be in motion... motion would cause a slight change in the timing of the received signal due to the Doppler effect; this would make accurate sampling of 8-VBS modulation impossible. Enhanced 8-VBS or E8-VBS seeks to overcome this limitation of motion by broadcasting a more robust signal at a lower data rate."
http://en.wikipedia.org/wiki/Talk:ATSC_Standards#Why_doesn.27t_ATSC_work_in_moving_vehicles.3F