Research report - Institute of Transportation Studies ; UCB-ITS-RR-79-8 Research report - Institute of Transportation Studies ; UCB-ITS-RR-79-1 Research report - Institute of Transportation Studies ; UCB-ITS-RR-79-4 Research report - Institute of Transportation Studies ; UCB-ITS-RR-79-6 Research report - Institute of Transportation Studies ; UCB-ITS-RR-79-9 Graduate report / Institute of Transportation Studies ; Working paper - Institute of Transportation Studies, University of California ; UCB-ITS-WP-79-8 Dissertation series / Institute of Transportation Studies ; Working paper - Institute of Transportation Studies, University of California ; no. UCB-ITS-WP-79-5 Institute of Transportation Studies.