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1997
1997
1995
SHOULD EMERGENCY CALL BOXES BE PLACED IN FREEWAY MEDIANS?

Transportation Research Record, Issue 1485, p. 44-48

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1991
1986-01
1975
EXPERIENCE IN HANDLING FREEWAY CORRIDOR INCIDENTS IN HOUSTON

Transportation Research Board Special Report, Issue 153, pp 145-155

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1973
TWO-WIRE EMERGENCY CALL SYSTEM

Highway Research Record, Issue 450, pp 1-12

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1971
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