(分离式立交).
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0 0
Raff’s Model
rejected curve accepted curve
critical gap=6.6
1
2
3
4
5
6
7
8
9
10
11
12
Gaps (sec)
Cumulative Distribution of U-turn Gaps For Six-Lane Roadways (seven sites, sample size=1271)
all-way stop control is used where same level roadways intersect
The STOP sign used in Beijing, China
4. Capacity of TWSC
a. Priority of movements for TWSC b. Conflicting volume （冲突流量） c. Critical gap and follow-up time （临界可接受
the STOP signs are installed at approaches on minor street
vehicles on major street pass intersection without stopping, while vehicles on minor street have to stop first and then use gap to pass intersection
视距三角形)
d A (and
dB
)
d
0.278S i t
S
2 i
254(F
S
wk.baidu.com
2 f
G)
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,
Ranking of passing two-way stop control intersection
2. YIELD sign
used at unsignalized intersections where major and minor roadways are met,
the YIELD signs are installed at approaches on minor streets
YIELD sign in USA
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 approaches
first come first pass is observed
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
Chapter 7. Intersection design
7.1 Introduction of intersection control
Types of intersection
At-grade intersection Grade separation or interchange Roundabout (circle)
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
The difference between STOP and YIELD is that drivers do not necessarily stop at intersection approach where YIELD is applied.
YIELD sign in UK YIELD sign in China
Logit Model
110%
100%
90%
80%
Cumulative Probability
70%
accepted gaps
60%
50%
40%
30%
20%
10%
0%
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Gaps (sec)
Traffic signal
1. Merit
(1) provide orderly movement (2) enhance traffic-handling capacity (3) reduce frequency and severity of crashes (4) coordinate continuous movement along arterial (5) protect pedestrians and bikers
间隙与随车时距） d. Potential capacity （可能通行能力）
(vcx tcx / 3600)
c v [1e e ] px
cx
(vcx t fx / 3600)
Number of Vehicles Rejecting Gaps
8000 7000 6000 5000 4000 3000 2000 1000
At-grade intersection Roundabout
Interchange without ramps
(分离式立交)
Interchange with ramps
(互通式立交)
Introduction to intersection control
Basic rule of road （基本通行规则）---
Raff’s Model
rejected curve accepted curve
critical gap=6.6
1
2
3
4
5
6
7
8
9
10
11
12
Gaps (sec)
Cumulative Distribution of U-turn Gaps For Six-Lane Roadways (seven sites, sample size=1271)
all-way stop control is used where same level roadways intersect
The STOP sign used in Beijing, China
4. Capacity of TWSC
a. Priority of movements for TWSC b. Conflicting volume （冲突流量） c. Critical gap and follow-up time （临界可接受
the STOP signs are installed at approaches on minor street
vehicles on major street pass intersection without stopping, while vehicles on minor street have to stop first and then use gap to pass intersection
视距三角形)
d A (and
dB
)
d
0.278S i t
S
2 i
254(F
S
wk.baidu.com
2 f
G)
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,
Ranking of passing two-way stop control intersection
2. YIELD sign
used at unsignalized intersections where major and minor roadways are met,
the YIELD signs are installed at approaches on minor streets
YIELD sign in USA
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 approaches
first come first pass is observed
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
Chapter 7. Intersection design
7.1 Introduction of intersection control
Types of intersection
At-grade intersection Grade separation or interchange Roundabout (circle)
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
The difference between STOP and YIELD is that drivers do not necessarily stop at intersection approach where YIELD is applied.
YIELD sign in UK YIELD sign in China
Logit Model
110%
100%
90%
80%
Cumulative Probability
70%
accepted gaps
60%
50%
40%
30%
20%
10%
0%
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Gaps (sec)
Traffic signal
1. Merit
(1) provide orderly movement (2) enhance traffic-handling capacity (3) reduce frequency and severity of crashes (4) coordinate continuous movement along arterial (5) protect pedestrians and bikers
间隙与随车时距） d. Potential capacity （可能通行能力）
(vcx tcx / 3600)
c v [1e e ] px
cx
(vcx t fx / 3600)
Number of Vehicles Rejecting Gaps
8000 7000 6000 5000 4000 3000 2000 1000
At-grade intersection Roundabout
Interchange without ramps
(分离式立交)
Interchange with ramps
(互通式立交)
Introduction to intersection control
Basic rule of road （基本通行规则）---