SE-featured discipline Enforcement(执法) Education Engineering Environment Ecology(生态)
5E-featured discipline • Enforcement （执法） • Education • Engineering • Environment • Ecology (生态）
Chapter 2 Basic components in traffic ● engineering Road user characteristics Vehicle characteristics Geometric Characteristics of Roadways Traffic control devices
Chapter 2. Basic components in traffic engineering • Road User Characteristics--- • Vehicle Characteristics--- • Geometric Characteristics of Roadways - -- • Traffic Control Devices ---
Road user characteristics Including drivers, bikers and pedestrians start of perception to the end of reaction (2.5 Y Perception- reaction time(反应时间)-ror second is very common); it varies greatly from person to person, from situation to situation Ⅴ isual acuity-- static and dynamic(静视力, 动视力) Attention -- location urban and rural
Road User Characteristics • Including drivers, bikers and pedestrians • Perception-reaction time （反应时间）--- from start of perception to the end of reaction (2.5 second is very common); it varies greatly from person to person, from situation to situation • Visual acuity --- static and dynamic （静视力， 动视力） • Attention --- location: urban and rural
Fatigue -- potential for high crash rate Drunk-drive -- increase of PRT time and high likelihood to make a wrong decision; Awareness of variability --due to age, sex, personalit ●●●。●● Very few studies on bikers Walking speed -- design for pedestrians
• Fatigue --- potential for high crash rate • Drunk-drive --- increase of PRT time and high likelihood to make a wrong decision; • Awareness of variability --- due to age, sex, personality …… • Very few studies on bikers • Walking speed --- design for pedestrians
Percentile(百分位) a value in a distribution for which the stated percentage of the population has a characteristics that is less than or equal to the specified value, 15, 50 and 80 percentiles are very common
• Percentile (百分位）---- a value in a distribution for which the stated percentage of the population has a characteristics that is less than or equal to the specified value, 15, 50 and 80 percentiles are very common