TY  - BOOK
AU  - Hauer,Ezra
TI  - Observational before-after studies in road safety: estimating the effect of highway and traffic engineering measures on road safety/ 
SN  - 9780080430539 
PY  - 1997///
CY  - WA, United Kingdom : 
PB  - Emerald Group Publishing Limited, 
KW  - Traffic engineering
KW  - Traffic safety
N1  - Includes bibliographical references and index
ER  -