Experimental Study on Speed Reduction Effect by Sequence Design

adachi, yukio; Fujii, Yasuo; Tamagawa, Dai; Iwasato, Yasuyuki; Yamada, Kazuo; Nakamura, Yuki

doi:10.2208/jscejd.66.27

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…Additionally, road agencies can make decisions based on the CGAQ. For example, Adachi et al ( 47 ) had considered high scores in Eyes on the Wall and the Difficulty of Grasping Distance in the original CGAQ to be undesirable for tunnel walls because high scores in these items were thought to be distracting. Because some researchers claim that laterally scattered pavement markings (e.g., Optical Dots ) convey helpful information about oncoming lane geometry to drivers ( 25 ), we do not make any conclusions here concerning whether this feature is good or bad for speed reduction markings.…”

Section: Discussionmentioning

confidence: 99%

“…Computer Generated Animation Questionnaire. A modified version of the Computer Generated Animation Questionnaire (CGAQ) (47) was used in this study to assess the participants' subjective feelings about the road markings. The original questionnaire was developed to assess designs on a tunnel wall, under the philosophy that exceedingly odd or distracting visual stimuli should not be used to avoid unintended driving maneuvers (e.g., harsh braking).…”

Section: Participantsmentioning

confidence: 99%

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Effects of Speed Reduction Marking Patterns on Simulated Driving Speed and Lane Position

Iio

Nakai

Usui

2022

Transportation Research Record: Journal of the Transportation R

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Speed reduction markings have been installed on highways as perceptual countermeasures for speeding. However, little is known about the effects of the shape and interval of road markings on driving speed and lane position. In this paper, a driving simulator experiment and questionnaires were performed to explore the effects of speed reduction marking patterns on driving speed and standard deviation of lane position (SDLP), as well as drivers’ subjective feelings, mental workload, and visual attention. Thirty-nine participants drove on a simulated two-lane rural highway where speed reduction markings with different shapes and intervals were presented at horizontal curves. The pavement markings were associated with reduced throttle values and mean speed in advance of a horizontal curve. The marking shape did not affect participants’ speed choice or SDLP. A cognitive alerting effect of the speed reduction markings was dominant because the participants did not drive more slowly with the markings with converging intervals toward the traveling direction compared to those with a constant interval. A questionnaire on drivers’ attention reflected a potential use of road markings for drivers’ lane-position maintenance. Since less than 18 % of the participants noticed the convergence in marking intervals, speed reduction markings may also induce the perceptual illusion of acceleration.

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Section: Discussionmentioning

confidence: 99%

Section: Participantsmentioning

confidence: 99%

Effects of Speed Reduction Marking Patterns on Simulated Driving Speed and Lane Position

Iio

Nakai

Usui

2022

Transportation Research Record: Journal of the Transportation R

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“…One such pattern consists of transverse lines with progressively reduced spacing to give drivers the impression that their speed is increasing. The road markings verified as inducing a deceleration effect on multi-lane straight roads include "optical dot" roadsurface markings at the Bijogi Junction Saitama-Omiya Line of the Metropolitan Expressway Company [1] and "sequence design" tunnel wall markings in the Inariyama tunnel on the Hanshin Expressway Company's Kyoto Line [2]. However, we do not well understand how the patterns of progressively reduced spacing in these cases actually induce drivers to decelerate.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Effect of Sequential Transverse and Lateral Markings on Perceived Speed on a Single-lane Straight Road

K¹

2015

Ergonomics

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We focus on the vehicle speed inducement effect of sequence patterns of transverse and lateral markings on a single-lane straight road. We test the effectiveness of several sequence patterns through experiments with a driving simulator. The sequence patterns are characterized by patterns of progressively and concurrently reduced spacing of transverse lines on the road surface and lateral poles on the roadside. We examine the discrepancy between vehicle speed and speed perceived by the drivers under the influence of several sequence patterns, estimating driver-perceived speed using a hidden Markov model. Experiments show that (1) perceived speed tends to be higher than actual vehicle speed, except for patterns where lines and poles were equally spaced in all intervals or where spacing was greatly decreased in the middle intervals, and (2) in the case of a pattern where spacing was greatly decreased in the first intervals, vehicle speed rapidly decreased while the perceived speed remained high.

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Experimental Study on Speed Reduction Effect by Sequence Design

Cited by 2 publications

References 5 publications

Effects of Speed Reduction Marking Patterns on Simulated Driving Speed and Lane Position

Effects of Speed Reduction Marking Patterns on Simulated Driving Speed and Lane Position

An Experimental Study on the Effect of Sequential Transverse and Lateral Markings on Perceived Speed on a Single-lane Straight Road

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