- 1、本文档共48页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
年平均日交通量)课件
Chapter 3. Volume, Density Speed Studies and Characteristics ;1. Volume;Some useful volumes;宪锁口哇拐犁儒导童咆鹊屑处衣湿邑娜啥遵貌镐帽渡琢趟术讨贾雅锌团汁年平均日交通量)课件年平均日交通量)课件;婶媚嗣踞衅巨钳崎酬坠肩尖迭亢易讨驻或庙厅桶韶虾略葱捻员麦齐轰专蟹年平均日交通量)课件年平均日交通量)课件;Daily variation factor (DF) --- is defined as ratio of AADT over yearly average volume for particular day of week (Monday, Tuesday etc.);Monthly variation factor (MF) --- is defined as ratio of AADT over ADT for particular month of the year;Hourly volumes and peak hour volume (小时流量,高峰小时流量)
Hourly volumes are used to reflect variation (fluctuation) of traffic volume in a day
Peak hour volume is defined as the volume in the single hour that has the highest hourly volume;Rate of flow (流率)--- defined as an equivalent hourly volume for a given interval (interval can be 5, 10, 15 minutes)
used in design to reflect the worst scenario
used in modeling mathematical relationship among parameters in research
generally the shorter the interval the higher the rate of flow ; Interval Volume Interval Volume
7:00 – 7:05 15 7:30 – 7:35 17
7:05 – 7:10 25 7:35 – 7:40 35
7:10 – 7:15 18 7:40 – 7:45 28
7:15 – 7:20 42 7:45 – 7:50 32
7:20 – 7:25 31 7:50 – 7:55 26
7:25 – 7:30 18 7:55 – 8:00 20;Peak hour factor (高峰小时系数)--- is defined as the ratio of hourly volume divided by maximum rate of flow ;Peak-Hour-Factor (PHF);The 30th hourly volume (第30位小时交通量) --- defined as an hourly volume at which its ranking on yearly-counting curve counts 30th among 8760 hourly volumes in a year
DDHV (Directional Design Hourly Volume 设计小时流量) --- DDHV = AADTⅹK ⅹD where: K is proportion of daily traffic occurring during the peak hour, expressed as a decimal; D is proportion of peak-hour traffic traveling in the peak direction, expressed as a decima
文档评论(0)