cerns about the preferences of the drivers from this experiment. These results show that, at least the 25- to 34-year-old drivers tested liked what they saw about the AHS. However, while traveling in the AHS lane, drivers generally prefer longer distances between successive cars within a string of cars than the 1/16 sec intrastring distances, and they prefer the faster AHS design speeds over the slower one, although both preferences were at best mild (Questions 12 and 13 on Table 18.5, respectively, show average scores of 36% and 69%, which are closer to the middle than the extremes).
A major conclusion from the ergonomic viewpoint is that the maneuver for entering the automated lane with this AHS configuration used here appears to be easy, effective, and safe. This conclusion needs to be qualified to say that it is difficult to adequately assess automotive safety from these limited simulation results. The conclusions in Buck, Yenamandra, and Bloomfield ( 1994) and Yenamandra ( 1994) are essentially the same.
Considering system effectiveness, the use of a low velocity differential for vehicle entry to the AHS and some automatic form of control transfer are recommended. The reason for recommending the low velocity differential is that higher differentials necessitate much larger gaps between successive strings of cars and those larger gaps greatly reduce traffic capacity. Added delays due to the manual method of transferring vehicular control reduce traffic capacity even more.
The authors are greatful to the U.S. Department of Transportation for its sponsorship of this research effort. However, the published materials represent the position of the authors and not necessarily that of the Department of Transportation. Also, the authors recognize the extensive contributions of John R. Bloomfield and J. Marty Christensen, both of the Center for Computer Aided Design of the University of Iowa, Engineering Research Facility, Iowa City, Iowa.
Alicandri E., & Moyer M. J. ( 1992). "Human factors and the automated highway system." Proceedings of the 56th Annual Meeting of the Human Factors Society, pp. 1064-1067.