1. Uheldsmønsteret på almindelige 4-sporede veje;Andersen,1977
2. Median barriers: One year's experience and further controlled fullscale tests;Beaton,1962
3. Effect of median barriers on driver behavior;Billion;Highway Research Board Bulletin,1956
4. Median accident study—Long Island, New York;Billion;Highway Research Board Bulletin,1962
5. Effect of parkway medians on driver behavior—Westchester County parkways;Billion;Highway Research Board Bulletin,1962