Researchers have estimated that as many as 80 percent of all automobile accidents can be attributed to the psychological condition of the driver.Emotional upsets can change drivers’ reactions，slow their judgment，and make them blind to the dangers that might otherwise be evident.The experts warn that it is vital for every driver to make a conscious effort to keep his/her emotions under control.

　　Yet the irresponsibility that accounts for much of the problem isn’t only put upon drivers.Street walkers regularly ignore or break traffic regulations.They are blamed in most vehiclewalker accidents，and many cyclists even believe that they are not subject to the basic rules of the road.

　　Significant legal advances have been made towards safer driving in the past few years.Safety standards for vehicles have been raised both at the point of manufacture and through regular road inspections.In addition，speed limits have been lowered.Due to these measures，the accident rate has decreased.But the accident experts still worry because there has been little or no improvement in the way drivers behave.The only real and lasting solution，say the experts，is to make people believe that driving is a skilled task requiring constant care and concentration.Those who fail to do all these things present a threat to those with whom they share the road.

　　50．Traffic accidents may be regarded as a social problem because________.

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