NASA NTRS · 19780000021
Optical traffic-sensing concept
Abstract
Scaled-up optical proximity detector is versatile traffic sensor that replaces or augments existing systems such as inductive loops. Photosensor which does not depend on ambient light has several features that protect it against spurious or ambiguous inputs. It could be implemented in several forms to cope with different roadway conditions.
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Johnston, A. R., Shimada, K.. 1978-06-01. Optical traffic-sensing concept. https://ntrs.nasa.gov/citations/19780000021
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