urban roads. scope of urban roads urban/suburban road segments continuous permanent development...
Post on 20-Dec-2015
218 views
TRANSCRIPT
URBAN ROADSURBAN ROADS
Scope of Urban RoadsScope of Urban Roads
• Urban/Suburban Road Segments continuous permanent development along all or almost of its length, on at least one side of the road. Population at least 100.000
• Interurban Road Segments without continuous development on either side, such as restaurants, factories, or villages.
Scope of Urban RoadsScope of Urban Roads
• Urban Road Types– Two-lane two-way roads (2/2 UD)– Four-lane two-way roads
• Undivided (i.e. no median) (4/2 UD)• Divided (i.e. with median) (4/2 D)
– Six-lane two-way divide roads (6/2 D)– One-way roads (1-3/1)
Scope of Urban RoadsScope of Urban Roads
• Conditions:
• Flat or essentially flat alignment
• Straight or essentially straight horizontal alignment
• On segments of roads which are not affected by queuing caused by intersections, nor by severe platooning downstream form signalised intersections
Scope of Urban RoadsScope of Urban Roads
• Road Segments:
• Between and unaffected by signalised or major unsignalised intersections, and
• Having similar characteristics along its length.
Objective of Urban RoadsObjective of Urban Roads
• Design of urban roads should be selected with the aim to ensure that degree of saturation does not exceed an acceptable value (normally 0,75)
Traffic Safety ConsiderationsTraffic Safety Considerations
• Widening of the lane decreases the accident rates between 2-15% per meter widening (the high number refers to narrow roads).
• Widening and improvement of shoulder surface conditions improves traffic safety, although to a smaller degree than lane widening
Traffic Safety ConsiderationsTraffic Safety Considerations
• A median reduces the accident rate with 30%
• Median barriers (used when the space is insufficient to make a full median) reduce fatal and severe injury accidents with 10-30%, but increase damage only accidents.
Urban Roads Performance IndicatorUrban Roads Performance Indicator
• Degree of Saturation (≤ 0,75)
• Level of Service (A – F)
• Average Speed
• Travel Time
Level of Service Level of Service Based on Average SpeedBased on Average Speed
Kelas Arteri I II III
Kecepatan (km/jam)
72 - 56 56 - 48 56 – 40
LOS Kecepatan Rata-rata (km/jam)
A ≥ 56 ≥ 48 ≥ 40
B ≥ 45 ≥ 38 ≥ 31
C ≥ 35 ≥ 29 ≥ 21
D ≥ 28 ≥ 23 ≥ 15
E ≥ 21 ≥ 16 ≥ 11
F 21 16 11
STEP A-1: General DataSTEP A-1: General Data
• Date (day, month, year) and Handled by• Province• City name• City size (number of inhabitants)• Link number/road name• Segment between … or …• Segment code• Area type (COM, RES, RA/Frontage Road)• Length of segments• Road type (4/2 D, 4/2 UD, 2/2 UD, 2/1)• Time period• Case number
STEP A-2: Geometric ConditionsSTEP A-2: Geometric Conditions
• Compass arrow showing North• Km-posts• Sketch of the horizontal alignment• Arrows identifying Direction 1 (North or East-
bound) and Direction 2 (South or West-bound)• Names of the places• Major buildings• Intersections and entries/exits• Pavement markings
STEP A-3: Traffic ConditionsSTEP A-3: Traffic Conditions
Default values for traffic composition
City size LV% HV% MC%
0,1 M.Inh 45 10 45
0,1 – 0,5 M.Inh 45 10 45
0,5 – 1,0 M.Inh 53 9 38
1,0 – 3,0 M.Inh 60 8 32
3,0 M.Inh 69 7 24
STEP A-3: Traffic ConditionsSTEP A-3: Traffic Conditions
Road type: Undivided roads
Traffic flow total both directions (veh/h)
pce
HV
MC
Carriageway width Wc (m)
6 > 6
Two-lane undivided (2/2 UD)
0 – <1.800 1,3 0,50 0,40
1.800 1,2 0,35 0,25
Four-lane undivided (4/2 UD)
0 – <3.700 1,3 0,40
3.700 1,2 0,25
STEP A-3: Traffic ConditionsSTEP A-3: Traffic Conditions
Road types: One-way roads and Divided roads
Traffic flow per lane (veh/h)
pce
HV MC
Two-lane one-way (2/1) and Four lane divided (4/2 D)
0 – <1.050 1,3 0,40
1.050 1,2 0,25
Three-lane one-way (3/1)
and Six-lane divided (6/2 D)
0 – < 1.100
1,3 0,40
1.100 1,2 0,25
STEP A-4: Side FrictionSTEP A-4: Side Friction
• Number of pedestrians passing along or crossing the road segment (0,5) /h,200m
• Number of stopping vehicles and parking maneuvers (1,0) /h,200m
• Number of motor vehicle entries and exists to/from roadside properties and side roads (0,7) /h,200m
• Flow of slow-moving vehicles (bicycles, tricycles, horse-charts, oxcarts, tractors, etc. (0,4) /h
Road Side FrictionRoad Side Friction
Road Side FrictionRoad Side Friction
Road Side FrictionRoad Side Friction
Road Side FrictionRoad Side Friction
STEP A-4: Side FrictionSTEP A-4: Side FrictionSide friction class
CodeWeighted number of events per 200 m per hour (both sides)
Typical conditions
Very low VL < 100 RES, frontage road
Low L 100 – 299RES, public transport
Medium M 300 – 499Industrial are + roadside shops
High H 500 – 899COM + high roadside activity
Very High VH ≥ 900COM with roadside market activities
STEP B-1: Analysis STEP B-1: Analysis of Free-flow Speedof Free-flow Speed
• FV free-flow speed for LV at actual conditions (kph)
• FV0 Base free-flow speed for light vehicles (kph)
• FVW Adjustment for effective carriageway width (km/h)
• FFVSF Adjustment factor for side friction conditions
• FFVCS Adjustment factor for city size
CSSFW FFVFFVFVFVFV 0
STEP B-1: Analysis STEP B-1: Analysis of Free-flow Speedof Free-flow Speed
Road typeBase free-flow speed FV0 (kph)
LV HV MC All (mean)
Six-lane divided (6/2 D) or Three-lane one-way (3/1) 61 52 48 57
Four-lane divided (4/2 D) or Two-lane one-way (2/1) 57 50 47 55
Four-lane undivided (4/2 UD) 53 46 43 51
Two-lane undivided (2/2 UD) 44 40 40 42
STEP B-2: STEP B-2: Free-flow Speed Adjustment Free-flow Speed Adjustment FVFVWW for Carriageway Width for Carriageway Width [Table B-2:1][Table B-2:1]
• Four-lane divided (4/2 D) or One-way road• FVW = 8 WC – 28
• Four-lane undivided (4/2 UD)• FVW = 8 WC – 28
• Two-lane undivided (2/2 UD)• FVW = -0,0285 WC 6 + 1,3687 WC 5 - 27,066 WC 4
+ 281,74 WC 3 -1628,4 WC 2 + 4959,4 WC - 6230
STEP B-2: STEP B-2: Free-flow Speed Adjustment Free-flow Speed Adjustment FVFVWW for Carriageway Width for Carriageway Width [Table B-2:1][Table B-2:1]
• Four-lane divided (4/2 D) or One-way road, and Four-lane undivided (4/2 UD)
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
3.00 3.25 3.50 3.75 4.00
Effective Carriageway Width (We) [m]
FV
w [
km
/h]
STEP B-2: STEP B-2: Free-flow Speed Adjustment Free-flow Speed Adjustment FVFVWW for Carriageway Width for Carriageway Width [Table B-2:1][Table B-2:1]
• Two-lane undivided (2/2 UD)
-10.0
-9.0
-8.0
-7.0
-6.0
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 9.50 10.00 10.50 11.00
Effective Carriageway Width (We) [m]
FV
w [
km/h
]
STEP B-3: STEP B-3: Free-flow Speed Adjustment Free-flow Speed Adjustment Factor FFVFactor FFVSFSF for Side Friction for Side Friction
• Road with shoulders• Table B-3:1
• Road with kerbs• Table B-3:2
• Adjustment factor FFVSF for six-lane roads• FFV6SF = 1 - 0,8 x (1 - FFV4SF)
Roads with ShouldersRoads with Shoulders
Roads with KerbsRoads with Kerbs
STEP B-4: STEP B-4: Free-flow Speed Adjustment Free-flow Speed Adjustment Factor FFVFactor FFVCSCS for City Size for City Size
City Size Inhab. (M) FFVCS
Very Small 0,1 0,90
Small 0,1 - 0,5 0,93
Medium 0,5 - 1,0 0,95
Large 1,0 - 3,0 1,00
Very Large 3,0 1,03
STEP B-5: STEP B-5: Determination of Free-flow Determination of Free-flow Speed for Actual ConditionsSpeed for Actual Conditions
• Free-flow speed for light vehicles (LV)• FV = (FV0 + FVW) x FFVSF x FFVCS
• Free-flow speed for other vehicle types• FFV = FV0 – FV• FVHV = FVHV0 – FFV x FVHV0/FV0
• FVHV0 Table B-1:1
STEP C-1: Base CapacitySTEP C-1: Base Capacity
Road TypeBase Capacity
(pcu/h)Comment
Four-lane divided 4/2 D or One-way
road 1-3/11.650 Per lane
Four-lane undivided 4/2 UD
1.500 Per lane
Two-lane undivided 2/2 UD
2.900Total in both directions
STEP C-2: STEP C-2: Capacity Adjustment Factor Capacity Adjustment Factor FCFCWW for Carriageway Width for Carriageway Width [Table C-2:1][Table C-2:1]
• Four-lane divided (4/2 D) or One-way road• FCW = 6,25 WC – 2,75
• Four-lane undivided (4/2 UD)• FCW = 5,424528 WC – 1,92453
• Two-lane undivided (2/2 UD)• FCW = -12.424 WC 6 + 76.838 WC 5 – 195.332 WC 4
+ 260.873WC 3 -192.689WC 2 + 74.455WC – 11.715
STEP C-2: STEP C-2: Capacity Adjustment Factor Capacity Adjustment Factor FCFCWW for Carriageway Width for Carriageway Width [Table C-2:1][Table C-2:1]
• Four-lane divided (4/2 D) or One-way road
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1.00
1.01
1.02
1.03
1.04
1.05
1.06
1.07
1.08
3.00 3.25 3.50 3.75 4.00
Effective Carriageway Width (We) [m]
FC
w
STEP C-2: STEP C-2: Capacity Adjustment Factor Capacity Adjustment Factor FCFCWW for Carriageway Width for Carriageway Width [Table C-2:1][Table C-2:1]
• Four-lane undivided (4/2 UD)
0.91
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1.00
1.01
1.02
1.03
1.04
1.05
1.06
1.07
1.08
1.09
3.00 3.25 3.50 3.75 4.00
Effective Carriageway Width (We) [m]
FC
w
STEP C-2: STEP C-2: Capacity Adjustment Factor Capacity Adjustment Factor FCFCWW for Carriageway Width for Carriageway Width [Table C-2:1][Table C-2:1]
• Two-lane undivided (2/2 UD)
0.56
0.61
0.66
0.71
0.76
0.81
0.86
0.91
0.96
1.01
1.06
1.11
1.16
1.21
1.26
1.31
5.00 5.50 6.00 6.50 7.00 7.50 8.00 8.50 9.00 9.50 10.00 10.50 11.00
Effective Carriageway Width (We) [m]
FC
w
STEP C-3: STEP C-3: Capacity Adjustment Factor Capacity Adjustment Factor FCFCSPSP for Directional Split for Directional Split
Directional split SP %-%
50-50 55-45 60-40 65-35 70-30
FCSP
Two-lane 2/2
1,00 0,97 0,94 0,91 0,88
Four-lane 4/2
1,00 0,985 0,97 0,955 0,94
STEP C-4: Capacity AdjustmentSTEP C-4: Capacity Adjustment Factor FCFactor FCSFSF for Side Friction for Side Friction
• Road with shoulders• Table C-4:1
• Road with kerbs• Table C-4:2
• Adjustment factor FCSF for six-lane roads• FC6SF = 1 - 0,8 x (1 - FC4SF)
STEP C-5: Capacity STEP C-5: Capacity Adjustment Factor Adjustment Factor FCFCCSCS for City Size for City Size
City Size Inhab. (M) FFVCS
Very Small 0,1 0,86
Small 0,1 - 0,5 0,90
Medium 0,5 - 1,0 0,94
Large 1,0 - 3,0 1,00
Very Large > 3,0 1,04
STEP C-6: Determination of Capacity STEP C-6: Determination of Capacity for Actual Conditionfor Actual Condition
• C Capacity (pcu/h)• C0 Base capacity (pcu/h)• FCW Adjustment factor for carriageway width• FCSP Adjustment factor for directional split• FCSF Adjustment factor for side friction• FCCS Adjustment factor for city size
CSSFSPW FCFCFCFCCC 0
STEP D-1: Degree of SaturationSTEP D-1: Degree of Saturation
• Q Traffic flow (pcu/h)• Q UR-2 (column 10 row 5 for undivided road)• Q UR-2 (column 10 row 3 & 4 for each
direction of travel on divided road)
• C Capacity (pcu/h)• C UR-3 (column 16)
CQDS /
STEP D-2: Speed and Travel TimeSTEP D-2: Speed and Travel Time
• Determine the speed at actual traffic• Figure D-2:1 (two-lane undivided roads)• Figure D-2:2 (multi-lane and one-way roads)
• Enter segment length (km) in column 24 UR-3
• Calculate average travel time (hour) for Light Vehicle
LVVLTT /
STEP D-3: Evaluation of Traffic STEP D-3: Evaluation of Traffic PerformancePerformance
• If DS > 0,75 revise calculations
QUIZQUIZ
2,50 10,50
0,50 0,50
2,5010,50
LV HV MC1 2,575 235 3,2592 2,625 245 3,131
Pedestrian = 101/hParking, stopping vehicle = 35/hEntry + exit vehicle = 17/hSlow-moving vehicle = 29/h
Traffic Volume (veh/h)Direction