Representatives Edolphus Towns (D) and Cliff Stearns (R) have introduced a bill to Congress which would require a 2-year study to determine whether hybrid automobiles should have sound making devices to warn blind people of their presence.
The National Federation of the Blind lobbied for the measure. They are not aware of instances in which blind individuals have been hit by hybrids they didn't hear, but according to president Marc Maurer, "It's only a matter of time."
Testing demonstrated that hybrid vehicles moving slowly could not be heard from as great a distance as conventional vehicles. If the bill is adopted, the first louder hybrids could be sold beginning 2012.