The right lane of northbound Allisonville Road at Interstate 465 has been closed indefinitely following a car accident Tuesday. The Indiana Department of Transportation said a vehicle struck a steel bridge beam. Structural engineers said the bridge is safe for one through lane and one turn lane of northbound Allisonville Road. They also said the bridge is safe for the southbound lanes. One left-turn lane for the I-465 eastbound exit ramp will also be closed.