分离式立交课程.pptxVIP

分离式立交课程第1页/共24页 At-grade intersectionRoundabout 第2页/共24页 Interchange without ramps(分离式立交)Interchange with ramps(互通式立交) 第3页/共24页 Introduction to intersection controlBasic rule of road （基本通行规则）--- 1. Driver on the left yield to those on the right 2. Through traffic has right-of-way over turning movements 3. Sight distance should be met. (sight triangle 视距三角形) 第4页/共24页 STOP and YIELD signs ---1. Two-way STOP sign (TWSC 二路停车) most popular-used control method at unsignalized intersections where major and minor roadways are met, the STOP signs are installed at approaches on minor streetvehicles on major street pass intersection without stopping, while vehicles on minor street have to stop first and then use gap to pass intersection 第5页/共24页 Ranking of passing two-way stop control intersection第6页/共24页 2. YIELD sign used at unsignalized intersections where major and minor roadways are met, the YIELD signs are installed at approaches on minor streets vehicles on major street pass intersection without stopping, while vehicles on minor street have to slow down first and then use gap to pass intersection The difference between STOP and YIELD is that drivers do not necessarily stop at intersection approach where YIELD is applied.第7页/共24页 YIELD sign in UKYIELD sign in ChinaYIELD sign in USA第8页/共24页 3. Multi-way (Full-way or All-way) STOP sign （多路停车或全路停车）the STOP signs are installed at approaches on all approachesfirst come first pass is observed all-way stop control is used where same level roadways intersect第9页/共24页 第10页/共24页 The STOP sign used in Beijing, China第11页/共24页 4. Capacity of TWSCa. Priority of movements for TWSCb. Conflicting volume （冲突流量）c. Critical gap and follow-up time （临界可接受间隙与随车时距）d. Potential capacity （可能通行能力） 第12页/共24页 Raff’s Model第13页/共24页 第14页/共24页 Traffic signal1. Merit (1) provide orderly movement?(2) enhance traffic-handling capacity (3) reduce frequency and severity of crashes (4) coordinate continuous mo