Now showing items 15211-15220 of 15227
The influence of sun loading on the visibility of clear-lens turn signals
(University of Michigan, Ann Arbor, Transportation Research Institute, 1998)
There is some concern that turn signal lamps with clear outer lenses make it difficult
in bright, sunny conditions to decide whether the signal is on or not. Two studies were
performed. The first study was a survey of ...
Effects of retroreflective marking color on pedestrian detection distance
(University of Michigan, Ann Arbor, Transportation Research Institute, 1998)
A nighttime field study was conducted to assess the effects of color on the detection of retroreflective pedestrian markings. Participants, seated in a stationary vehicle with its low-beam headlamps on, indicated when a ...
Just noticeable differences for low-beam headlamp intensities
(University of Michigan, Ann Arbor, Transportation Research Institute, 1997)
A recent study by Huey, Dekker, and Lyons (1994) concluded that a difference between two signal lamp intensities of less than 25% cannot be detected reliably by most drivers.
Consequently, Huey et al. recommended that an ...
Automotive collision warning effectiveness: a simulator comparison of text vs. icons.
(University of Michigan, Ann Arbor, Transportation Research Institute, 1996)
To demonstrate the usefulness of an enhanced driving simulator capable of displaying traffic, 24 drivers participated in an experiment evaluating alternative formats for collision warnings that might appear on a head-up ...
The influence of hydrophobic windshield coating on driver visual performance
(University of Michigan, Ann Arbor, Transportation Research Institute, 1997)
This experiment evaluated potential benefits of hydrophobic coating of windshields under simulated conditions of use. The main independent variables were hydrophobic
treatment, participant age, and time of day. The dependent ...
Effects of realistic levels of dirt on light output of rear signal lamps
(University of Michigan, Ann Arbor, Transportation Research Institute, 1997)
This study evaluated changes in the light output of rear signal lamps as a function of dirt accumulated during a 482-km drive, representing a 10-day amount of driving for a typical U.S. driver. The complete route was ...
The measurement of dark adaptation level in the presence of glare.
(University of Michigan, Ann Arbor, Transportation Research Institute, 1989-11)
An investigation was carried out to measure the effect of glare on driver dark adaptation. The procedure used was to measure the time after the glare was extinguished until the subject could detect a target light source. ...
Dynamic Stability of a Composite Circular Cylindrical Shell Subjected to Combined Axial and Torsional Loading
(Sage Publications, 1993)
The dynamic stability of thin, clamped, composite circular cylindrical shells is studied for combined axial and torsional loading. Each load is taken to be har monically varying; the frequencies of the two loads differ, ...
The international road roughness experiment: establishing correlation and a calibration standard for measurements
(University of Michigan, Ann Arbor, Transportation Research Institute, 1986)
Conspicuity and glare properties of daytime running lights: effects of lamp separation and intensity
(University of Michigan, Ann Arbor, Transportation Research Institute, 1998)
This study evaluated the influences of lamp separation and lamp intensity on the effectiveness of daytime running lights. Subjects performed two tasks. They rated discomfort glare from a pair of lamps, and evaluated the ...