TPDM Vol 4 highlight

TPDM Vol 4 highlight - Transport Planning and Design Manual...

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1 Transport Planning and Design Manual Vol 4
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21 Phase A Phase B Early cut-off Phase C Phase E Time CASE 1 NB NB/RT SB Saturation flow 1900 1200 2080 Volume 500 100 200 Flow ratio (y) 0.263158 0.083333 0.096154 Critical y 0.263158 CASE 2 NB NB/RT SB Saturation flow 1900 1200 2080 Volume 300 100 200 Flow ratio (y) 0.157895 0.083333 0.096154 Critical y 0.157895 In CASE 1, only one lost time is incurred in this phase (which consists of two sub-phases) In CASE 2, two lost times are incurred in this phase (which consists of two sub-phases) The SB and RT traffic then split the green time allocated to this whole phase (remember to put an intergreen time between them) 0.179487179 0.179487179 Early early-off calculation
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22 When the single phase dominates, the green times for the sub-phases are split to make up of the single phase ( ) 1 gI −− ⎡⎤ ⎣⎦
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23 • When the two sub-phases dominate, the effective green time for the single phase: () ( ) 12 11 1 gg I g =− + + + Phase A Phase B Early cut-off Phase C Phase E Time
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TPDM Vol 4 highlight - Transport Planning and Design Manual...

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