On roads painted with chevrons drivers tend to feel that______ .

A．while pushing asteroids off course nuclear weapons would destroy the world
B．asteroids racing across the night sky are likely to hit Earth in the near future
C．the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime
D．workable solutions still have to be found to prevent a collision of asteroids with Earth

A．try out the Japanese method in certain areas
B．change the road signs across the country
C．replace straight, horizontal bars with chevrons
D．repeat the Japanese road patterns