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Crash Outcome Data Evaluation System (CODES)

Maryland’s Crash Outcome Data Evaluation System was established in 1997 with funding from the National Highway Traffic Safety Administration (NHTSA) in an effort to improve highway safety through the use of linked motor vehicle crash data collected from police, emergency medical services (EMS), hospitals, and other sources.

For the initial project, data from police, EMS, and hospitals for calendar years 1995 and 1996 were linked using probabilistic methodologies and Matchware software (now CODES 2000) provided by NHTSA. Such linked data have been used by the NSC for a variety of projects, abstracts, and papers, including a statewide study of injured motorcyclists, a study of older drivers, an analysis of mismatch collisions, a geographic analysis of pedestrian injuries, a study of the patterns of injury in frontal collisions, and a NHTSA report detailing the costs and consequences of lower extremity injuries (DOT HS 809 871, June 2005).

Since the development of the CODES Data Network, the NSC has continued our investigations into these and other areas of traffic safety. We have also responded to multiple data requests from NHTSA and other state and local agencies on topics such as motorcycle crashes, child safety seats and red light running.

With additional funding from the Maryland Highway Safety Office, the extent of this program has expanded to include a variety of analysis on a number of highway safety research topics using datasets provided from other state agencies. Each of the databases used is collected through the individual agencies routine course of business. Where necessary, data use agreements have been developed to guide the use of individual variables within the provided datasets.



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