Text traffic signs size in expressway work zone based on driver’s visual characteristics(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年04期
- Page:
- 71-78
- Research Field:
- 交通工程
- Publishing date:
Info
- Title:
- Text traffic signs size in expressway work zone based on driver’s visual characteristics
- Author(s):
- PENG Yu-hua; LU Ji-na
- (School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China)
- Keywords:
- traffic engineering; expressway; work zone; traffic sign; text height
- PACS:
- U491.52
- DOI:
- -
- Abstract:
- Text traffic signs in expressway work zone have effects on the characteristics of driver’s visibility under the conditions of different speed, road conditions and the sign’s multi-information, and different traffic signs sizes will cause the dimensions of freeway work zone driver’s visual experience of non-conformance. Therefore, this paper combined with freeway work zone traffic sign writing class message feature and took visibility characteristics of driver as a starting point to build the vehicle model based on the text height model of “road traffic signs and markings”, and designed the multi-word mark information visibility tests. By improving the algorithm of traditional text height, this paper proposed an optimization model which took the driving speed, the driver’s visibility features, information signs and other factors into consideration. The results show that the perception of Chinese characters and the value of time reading comprehension in reading traffic signs and markings are both based on the time visibility of a single Chinese character. Through multi-word mark information visibility tests, it is found that when the number of characters m is 6 and above, it is difficult to reflect the visibility characteristics of multi-word mark information in current work zone. Optimized text height model fully considers driver’s visible characteristics for traffic signs’ multi-information, and the text height value is more reasonable and comprehensive than national standard. On this basis, the design for signs size is optimized. Optimized text height algorithm is used to calculate the Chinese characters height, and then the design of Chinese characters type setting in national standard is adopted. It can not only meet the visibility requirements, but also maximize the use of sign layout. The design standards of freeway work zone traffic sign writing class size is proposed.
Last Update: 2016-07-29