One of the virtues of owning a hybrid or electric car is its super-quiet noise signature. But worries are growing that blind people are being endangered by the vehicles' silence.

The government has set up a panel involving automakers, consumer groups and organizations for the blind to find a solution, which could lead to the emission of virtual engine noise or sounds similar to cell phone ring tones, officials said.

A legal change would be needed to equip the vehicles with the special noise-making feature.

"We are still listening to different opinions and trying to figure out the best solution," said Yuta Kaga, spokesman for Toyota Motor Corp., which makes the popular Prius gas-electric hybrid and is represented on the panel.

The panel, which began meeting in July, plans to have a proposal ready by the end of the year, according to the Land, Infrastructure, Transport and Tourism Ministry.

The panel was set up partly in response to worries voiced by the blind. The Japan Federation of the Blind, which submitted a request in June, is asking the government to instruct hybrid-makers to make the vehicles safer for the blind.

An informal survey of 52 blind people carried out by the group last year found that more than half were terrified of hybrids because they were so quiet, although none reported being in an accident.

A Japanese daily reported Tuesday that such measures may be available on Toyota cars going on sale in 2010, possibly with radar to sense nearby pedestrians and making noise only at slow speeds.