. >> i can tou hearr bhear tour bm inside my home. i know the 50-foot roll is a state code. can you explain why it is 50 feet and not 10 or 20 feet? as residents talked about the multiple buses in their area, there is a cumulative impact of the noise. could you explain a little bit about why it is 50 feet? it seems intuitively that it should be a better protection against noise in the vehicle code or local government been able to protect against that level of noise in a quiet residential neighborhood. >> the standard is based upon the practicality of being able to house an annunciation system and had it function for the patrons or passengers and at the same time, the technology other than to have a personal fault -- personal amplification system or earphones. >> if the engine of a bus, that is a certain level of noise. p a system should be able to speak above that volume of the engine of the vehicle. that might be one reason why it is 50 feet? >> the reason why it is 50 feet is simply because from a practical standpoint, most stereos in cars and most amplification systems on

. >> i can tou hearr bhear tour bm inside my home. i know the