Disciplina: Engenharia de Tráfego Rodoviário. Session 11: Methods

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Alison Crawford
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1 Mstrado Intgrado m Engnharia Civil Mstrado m Engnharia do Trritório Disiplina: Engnharia d Tráfgo Rodoviário Prof. Rsponsávl: Filip Moura Sssion 11: Mthods MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 1

2 Estimation Modls Statistial Empirial Probabilisti - Gap aptan Gomtry and traffi inputs Gap aptan Analytial mthods Empirial mthods Capaity Simulation MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 2

3 Mthods EMPIRICAL English (TRL) Portugus Frnh Swiss PROBABILISTIC NAASRA (National Assoiation of Australian Stat Road Authoritis) Grman Grman MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 3

4 Dtrmining th irulation flow N N Entry Cirulation flows N S-W E-W E-S W N-S E-S N-E S N-E W-E W-N E W-N S-N S-W Cirulation flow Or Confliting flow W E S MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 4

5 English and Portugus Mthods Capaity is a funtion of six gomtri paramtrs. Approah width, v Entry width, Insribd irl diamtr, ICD Efftiv lngth of flar, l Entry angl, θ Entry radius, r MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 5

6 Computation of flar lngth Entry flaring is loalizd widning at th point of ntry. Normal Roundabouts usually hav flard ntris with th addition of on or two lans at th giv way lin to inras apaity. Singl lan ntris.g. thos at Compat Roundabouts, should b slightly flard to aommodat larg goods vhils. Evn a small inras in ntry width may inras apaity. Th avrag fftiv flar lngth, l', is th avrag lngth ovr whih th ntry widns. It is th lngth of th urv CF : AB = (ntry width). GH = v (approah half width at point G whih is th bst stimat of th start of th flar). GD is paralll to AH and distan v from AH (v is masurd along a lin prpndiular to both AH and GD and, thrfor, th lngth of AD is only qual to v if AB is prpndiular to th mdian at A). CF' is paralll to BG and distan ½ BD from th urv lin BG H F A G D l C B MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 6

7 English mthod EFFICIENCY FACTOR Q = k ( F f Q ) k =1" 0,00347 # " 30 ( ) " 0,978, 1 % r MAX STOCKAGE Cap. F = 303X 2 CORRECTION Fator f = 0,210t D(1 0,2X 2) + ACCUM. Potnial 0,5 t D = M * $ & ' - ) " 0,05/ + (. WITH X v = v S S 1,6( v) = l ' M ICD 60 = xp 10 MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 7

8 Portugus Mthod Q = k ( F f Q 1 EFFICIENCY FACTOR k = 1 0,00163( θ 30) 3,431 ( ) 0, 05 r MAX STOCKAGE Cap. CORRECTION Fator f ) F = 335,47X = 0,611t D( 0,457 0,2X 2) + ACCUM. Potnial 0,983 t D = M 2 WITH X v = v S S 1,6( v) = l ' M ICD 60 = xp 10 MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 8

9 Frnh Mthod Capaity is funtion of 5 gomtri paramtrs Exit width Entry width Insribd irl diamtr Triangular island width Cirulatory roadway width MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 9

10 Frnh mthod Whr Q Q = ( Q )( ( ENT 3.5)) = ( Q + 2/3Q (1 SEP /15))( ( ANN 8)) t s Q Confliting flow; Qs xit flow (in th analysd approah); Qt irulating flow (passs in front of th analysd approah); ENT Entry width ; ANN Cirulatory roadway width; SEP Triangular island width. MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 10

11 Swiss mthod Capaity funtion of 3 gomtri paramtrs Numbr of lans in th roundabout Numbr of ntry lans Distan among onfliting points, b MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 11

Q D Disturbing flow TCU Saturation flow at th ntry Q s Exit flow; Q Cirulation flow

12 Swiss mthod C = 1!!(1500" 8 9 Qg ) Q D =!Q +"Qs TCU Coffiints Q = γ. C.100% α influn of xit flow (dpnds on th distan btwn onfliting points) C Entry apaity Q D Disturbing flow TCU Saturation flow at th ntry Q s Exit flow; Q Cirulation flow (in th irulatory roadway); Valus of β (nº of lans in th ring) 1 lan 2 lans 3 lans 0,9 1,0 0,6-0,8 0,5 0,6 Valus of γ (nº of ntry lans) β rdution fator γ flow distribution 1 lan 2 lans 3 lans 1,0 0,6-0,7 0,5 MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 12

13 Grman mthod Capaity funtion of two gomtri paramtrs Numbr of lans Numbr of ntry lans MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 13

14 Grman mthod Numbr of lans Entry irulatory Capaity of ntry or Q = , 740 Q Q = , 532 Q Q = , 500 Q Q = , 420 Q MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 14

15 NAASRA mthod (Australian) Q f hv Havy vhils adjustmnt fator; q onfliting flow (pu/s); α Critial Gap; β Follow-up hadway; = = f f Hv Hv 3600q 3600 β q ( α Δ ) ( 1 Δ q ) 1 q β q q > 0 = 0 Δ intra-bunh hadway (hadway btwn vhil irulating within th roundabout) MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 15

16 Grman mthod of gap aptan Q = f Hv Δ n q ( α 0.5β Δ ) q 1 Δ n q 3600 β f hv Havy vhils adjustmnt fator; q onfliting flow - traffi volum on th irulatory roadway (pu/s) N Numbr of irulatory lans (in roundabout) α Critial Gap (=4.1s.) β Follow-up hadway (=2.9s.) q > n n Δ Δ intra-bunh hadway - minimal tim gap on th irulatory roadway (=2.1s.). MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 16

17 Cas study - data ICD = 70 m Entry width = 7,0 m Lan width = 7,0 m Efftiv lnght of flar = Island width = 3,5 m Diamtr of th innr irl = 9,0 m Entry radius = 40 m Entru angl = 40º MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 17

18 Cas study rsults 3000 Lan apaity (p/hr) Conflit Fluxos d volum Conflito (p/hr) (uvl/h) Inglês Português Franês Suiço Almão AlmãoGap NAASRA MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 18

19 Othr mthods Ex-JAE HCM 2000 Sidra (volution of th australian mthod) MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 19

20 Comrial Softwar ANALÍTICAL & EMPÍRICAL ARCADY RODEL aasidra KREISEL GIRABASE HCS2000 SIMULATION CORSIM INTEGRATION SIMTRAFIC VISSIM PARAMICS MEC (Urbanismo, Transports Sistmas), MET, MPOT, MUOT 20

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