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Appendix: Sources and calculations

To see excel versions of the tabulations click here.

Rail

The source for passenger and tonne-km is the ORR’s National Rail Trends year book 2008

Equivalent bus plus lorry flows are obtained by:
 

(a) Dividing passenger-km by a bus occupancy of 20 (5 less than claimed as the occupancy of coaches leaving Victoria coach station) or 16
(b) Dividing tonne-km by 15 (half the capacity of a 44 tonne lorry)

Adding the results of (a) and (b) and dividing by (i) the days in the year, 365 and (ii) the track length, 32,000 km yields the average flow per track.
Dividing passenger-km and tonne-km by the track length yields the density of use.

The following table provides the data for the years 2000 to 2007.
 

Year 2000 2001 2002 2003 2004 2005 2006 2007
Pass km (bn) 38.2 39.1 39.7 40.9 41.8 43.2 46.2 49
Tonne km (bn) 19 20.6 19.7 20.1 21.6 23.1 23.2 22.9
Equivalent daily bus plus lorry flows
(a) 20 passengers per bus 272 285 282 290 302 317 330 340
(b) 16 passengers per bus 313 327 325 334 347 363 380 393
Density of use
Mn Passenger-km per km 1.19 1.22 1.24 1.28 1.31 1.35 1.44 1.53
Mn Tonne-km per km 0.59 0.64 0.62 0.63 0.68 0.72 0.73 0.72
Totals 1.79 1.87 1.86 1.91 1.98 2.07 2.17 2.25

Density of use

Densities of use are calculated by dividing the Passenger-km and Tonne-km by track or lane length.

As previously, the track length of the national rail network is 32,000 km. The lane length for the motorway and trunk road systems are estimated below where the route length for 2003 is from Table 7.8 of the TSGB and where the lane lengths assume (a) motorways average 6 lanes and Trunk roads 2 lanes and (b) motorways average 7 lanes and Trunk roads 3 lanes. In calculations the higher lane lengths have been used, namely 24,300 km for motorways and 52,000 km for motorways and trunk roads.

 

Route Length, Km

Lane Lengths, km

(a)

(b)

Motorways

3,477

20862

24339

Trunk Roads

9,340

18680

28020

Total

12,817

39542

52359

Road
The source for the data is Transport Statistics Great Britain.  In the table below:

  1. Carriageway lengths for 2006 are from Table the 7.9 of the TSGB 2008 or its equivalent for earlier years except that of 2000 to2001 there is no division between dual and single carriageways in the source.  Consequently for those years the division has been estimated using the proportions for 2003.  (Here we note that the section 7 of the TSGB 2008 has not been updated since November 2007)
  2. Lane lengths are estimated from:
    1. Motorway length x 6 plus dual carriageway length x 4 + single carriageway length x 2
    2. Motorway length x 6.5 plus dual carriageway length x 4.5 + single carriageway length x 2.25
  3. The passenger-km on the motorway and trunk road network have been estimated by allocating the values for all roads available from table 1.1. of the TSGB in proportion to the non-good vehicle-km estimated from TSGB table 7.4.
  4. Likewise, the tonne-km on the motorway and trunk road network have been estimated by allocating the values for all roads available from table 4.1. of the TSGB in proportion to the good vehicle-km estimated from TSGB table 7.4.
  5. The density of use has been obtained by dividing the estimates of the passenger and tonne-km by the mean of the two estimates for lane length.

Table 2 Motorway and trunk road data



Year 2000 2001 2002 2003 2004 2005 2006 2007
Lengths motorway and trunk roads (km)
Motorway 3467 3477 3477 3477 3524 3520 3558 3559
Dual Carriagways 4558 4563 4563 3645 3575 3490 3490 3597
Single Carriagways 7121 7129 7129 5695 5572 5293 5233 5196
Total Trunk 11679 11692 11692 9340 9147 8783 8723 8793
Lane Length (a) 53276 53372 53372 46832 46588 45666 45774 46134
Lane Length (b) 59068 59174 59174 51817 51531 50494 50606 51011
Vehicle, passenger and tonne-km
All roads                
All Veh-km  (bn) 466.5 473.7 485.9 490.3 498.6 499.4 506.4 513
Goods veh-km (bn) 28.2 28.3 28.3 28.47 29.4 29 29.1 29.4
Non-goods veh-km (bn) 438.3 445.4 457.6 461.83 469.2 470.4 477.3 483.6
Passenger-km (bn) 669 678 690 731 736 733 746 749
Tonne-km (bn) 150.5 149.4 149.8 162 163 163 167 173
Motorway and Trunk
All Veh-km (bn) NA 173.1 174.7 158.8 162.3 160.50 164.00 164.6
Goods veh-km (bn) NA 19.7 19 17.76 18.4 18.00 18.30 18.5
Non-goods veh-km (bn) NA 153.40 155.70 141.04 143.90 142.50 145.70 146.10
Est Passegner-km (bn) NA 233.51 234.77 223.24 225.73 222.05 227.72 226.28
Est Tonne-km (bn) NA 104.00 100.57 101.06 102.01 101.17 105.02 108.86
Density of use
Mn Passenger-km per km NA 4.15 4.17 4.53 4.60 4.62 4.73 4.66
Mn Tonne-km per km NA 1.85 1.79 2.05 2.08 2.10 2.18 2.24
Total NA 6.00 5.96 6.57 6.68 6.72 6.90 6.90
Percent on motorway and trunk
% veh-km on M and T NA 36.5 36.0 32.4 32.6 32.1 32.4 32.1
% Goods veh-km on M and T NA 69.6 67.1 62.4 62.6 62.1 62.9 62.9

 



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