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Highway-railroad grade crossings --- Truck drivers --- Safety measures. --- Psychology.
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Highway-railroad grade crossings --- Motor vehicle drivers --- Traffic safety --- Safety measures. --- Psychology.
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Railroad crossings --- Trespass --- Accidents --- Prevention.
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Highway-railroad grade crossings --- Railroad accidents --- Safety measures. --- Prevention.
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Highway-railroad grade crossings --- High speed trains --- Railroads --- Railroad accidents --- Safety measures. --- Planning. --- Prevention.
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Highway-railroad grade crossings --- Accidents --- Mathematical models.
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