August 1989

w i n g Left-Turn Signals to be Studied as an HP&R Proiect

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As pa* of a new HP&R study, researchers in Arizona will investigate the delay and accident consequences of switching pro- tected-only and protected/permitted left- turn signals from a leading green arrow to a lagging or mixed mode of operation. (Protected-only: During a protected-only

(green arrow)9 turning motorists can proceed without interfer- ence from opposing traffic. Protected/ Permitted: During a protected/permit- ted left-turn signal, turning motorists can proceed on (1) a green arrow light without

and On (2) a green light after yielding to Opposing traffic.) 'pti-

the mode of the re- searchers hope to improve signal progres-

and reduce and Intersections within 'ystems as well as isolated intersections will be in- cluded in the field evaluation. Contact: Davey Warren, 285-2426.

GRF Student to Evaluate Sign Color Rec- ognirion Under Various Lighting Svstems

Reza Saremi, a graduate student from

TFHRC Update

Oregon State University, began a research assignment on August 2 1 with the Traffic Safety Research Division. His assignment was made under NHI's Grants for Re- search Fellowships (GRF) program. Mr. Saremi will work in the night vision phase of FHWA's safety program and build upon the research findings developed by Syed Hussain during his 1987-88 GRF assign- ment at TFHRC. Mr. Saremi's study will be an evaluation of the color recognizabil- ity of standard highway sign colors as well as some of the American National Stan- dards Institute's safety colors (using retroreflective signing materials) under daylight, fixed sign lighting, headlighting (using both tungsten/halogen and metal halide headlamps), and a combination of fixed sign lighting and headlighting. Depending on the findings of the study, a change to some of the current highway colors may be justified. Contact: John Arens, 285-2427.

OFFICE OF IMPLEMENTATION

Engineering and Highway Operations Implementation Division (mT- 10)

Automated Pavement Distress Eaui~ment Conference Planned

TheAutomated Pavement Distress Equip- ment Conference is now scheduled for June 13 through June 15, 1990, at Iowa State University. The program will in- clude presentations by recognfzed experts from the public and private sectors. Itwll provide an oppoltunity for State and local highway to discuss their past experiences and their future needs. Numerous exhibits, equipment displays, and field demonstrations of various de- vices will allow attendees to gain first- hand knowledge of the latest technologi- cal advances in this area. An initial