1 - HKU Libraries

T.P.D.M.V.2.2
(Al/2001)
2.3 Passenger Car Units
2.3.1 P.C.U. Values
2.3.1.1 Passenger Car Unit values are given in Table 2.3.1.1. Although p.c.u.'s are no longer used in
the determination of the capacities of roundabouts or links these values have been included for
reference purposes.
Private Car, Taxi
Table 2.3.1.1 - Passenger Car Units
Urban
Standard
1.0
Eauivalent Value in P.C.U.'s
Rural
Standard
1.0
Roundabout
1.0
Traffic
Signal
Design
1.0
Light Goods Vehicle
1.5
1.5
1.5
1.5
Motor Cycle Motor
Scooter
0.75
1.0
0.75
0.40
Medium Goods
Vehicle
Heavy Goods Vehicle
Terrain
Ave Hilly Ave Hilly
2.0 3.0 2.0 4.0
2.5 3.0
2.5 3.0
2.8 1.75
2.8
1.75
Bus
3.0 4.0
3.0 4.0
2.8
2.0
Pedal Cycle
0.35
0.5
0.5
0.2
Tram
3.0
-
-
3.5-5.0+
Light Bus
1.5
1.5
1.5
1.5
Special purpose bus
2.0
2.0
Light Van
1.25
1.25
1.25
1.25
Tractor unit
3.0
3.0
2.3.1.2 For Medium or Heavy Goods Vehicle pcu values for hilly conditions are appropriate where the
gradient is greater than 4%, or there are long lengths of 4% gradient.
2.3.1.3 For trams pcu values vary from 3.5 pcu's for a clear approach to a junction, to 5.0 pcu's where a
tram island is sited near an approach. Where a tramway reserve is provided or where the
frequency of tram movements is so high as preclude the use of its lane by other vehicles, that
lane should be excluded in capacity calculation for mixed traffic.
2.3.1.4 Where, in any context, it is considered that p.c.u.'s are appropriate for design or other purposes,
the values used must be in accordance with Table 2.3.1.1.