Dimension

Indicator

Sources

Observations

Capacity, access and availability

Motorway density
(lane-km per million inhabitants)

Motorway length: Highways Agency data
Population data: Office for National Statistics (ONS),
http://data.london.gov.uk/datafiles/
demographics/ons-mye-population-totals.xls

Geographical coverage: England

Motorway density
(lane-km per km2)

Motorway length: Highways Agency data
Surface area: ONS
, UK Standard Area Measurements (SAM), http://data.london.gov.uk/datafiles/
demographics/ons-mye-population-totals.xls

Geographical coverage: England

Motorway density
(lane-km per million licensed vehicles)

Motorway length: Highways Agency data
Licensed vehicles: Department for Transport, table VEH0102
http://assets.dft.gov.uk/statistics/tables/veh0104.xls, (series "England")

Geographical coverage: England

Asset or capacity utilisation

Average capacity utilisation of motorways
(percentage of capacity)

Traffic on motorways: Department for Transport tableTRA0203 tab B, (series "motorways") http://assets.dft.gov.uk/statistics/tables/tra0203.xls
(series "England", "motorways")
Motorway length: Highways Agency data
Capacity per lane: 2000 vehicles / hour, default modelling assumption used by Department for Transport and the Highways Agency

Geographical coverage: England

Service quality and reliability

Average vehicle delay on the slowest 10 per cent of journeys on the Strategic Road Network
(minutes per mile)

Average delay: Department for Transport Table CGN0101,
http://www2.dft.gov.uk/pgr/statistics/
datatablespublications/roads/congestion
/previous/cgn0101.xls

Geographical coverage: Great Britain
December value is used

Asset condition

Motorways and HA managed trunk road condition
(Percentage of Lane 1 not exceeding investigatory level)

Road condition: Department for Transport table RDC0201,
http://assets.dft.gov.uk/statistics/tables/RDC0201.xls

Geographical coverage: England Weighted average by road length

Carbon emissions

Carbon emission by road vehicles
(g of CO2e per vehicle-km)

Carbon emissions by road: European Environment Agency vehicles (EEA), http://www.eea.europa.eu/
data-and-maps/data/nationa-emissions-reported
-to-the-unfccc-and-to-the-eu-greenhouse-
gas monitoring-mechanism-5 (series
"Road Transportation")
Traffic on all roads: Department for Transport table TRA0202 tab B (series "all roads"), http://assets.dft.gov.uk/statistics/tables/tra0202.xls

Geographical coverage for emissions:
United kingdom
Geographical coverage for traffic:
Great Britain
Time coverage: 2005-2009. 2010 value assumed equal to 2009 value

Safety

Fatalities on all roads
(fatalities per billion vehicle-km)

Fatalities: Department for Transport Table RAS45003 (series "killed"), http://assets.dft.gov.uk/statistics/tables/ras45003.xls

Geographical coverage: Great Britain