Safe roads, Reliable journeys, Informed travellers

Highways Agency’sJourney Time Reliability Target

With Thanks to Paresh TailorBusiness Planning & Performance

Brian HarbordTravel & Traffic Systems Group, SSR

Highways Agency

• Executive Agency of the Dept. for Transport• Operate, maintain and improve the strategic

road network • Framework Document – Aims and Objectives• Annual Business Plan – key performance

indicators

Highways Agency Performance

Improve Journey Reliability on SRN

Improve Air Quality

PSA Target

Reduce National Road casualties

HA Aim

Safe Roads, Reliable

Journeys, Informed Travellers

HA Objectives

Reducing Congestion and Improving Reliability

Improving Road Safety

Respecting the Environment

Seeking and Responding to Customer Feedback

Improving Efficiency

Improving Journey Reliability

• PSA target: By 2007-08, make journeys more reliable on the strategic road network.

• Measured by improving average delay on the slowest 10% of journeys on the strategic road network, compared to baseline period (August 2004 – July 2005).

Trip Journey TimesTRIP X AT NN:00 ON DAY Y

Average Journey Time

Excessive Delay

reference journey time

Journey Time achieved 9 times out of 10

Maj

or in

cide

nt

journey time

No. of trips

Delay on 10% worst journeys

Defining the Network

• Strategic road network divided into 103 routes • Delays from the 10% worst journeys

calculated for each of 103 routes, for each day of the week (Mon – Sun), for each time of day (0600-2000), measured in 15 minute intervals i.e. 80,752 combinations

• Between the baseline period of August 2004 to July 2005 and the target period of April 2007 to March 2008.

Baseline Calculation

• 3 values calculated for each of the 80,752 distributions:• delay in minutes for each of the worst journeys -

the difference between the route journey time and the “reference” journey time

• total delay experienced by all vehicles - delay calculated above multiplied by the flow along the route

• vehicle miles associated with those journeys - product of the number of vehicles and the route length

Baseline Headlines• Average delay associated with the worst

journeys is 3.5 min/10 miles (compared with 1.1 min/10 miles for all journeys)

• 31% of all delays are associated with the worst 10% journeys

• Figure higher in less congested periods (45% at weekends)

• 85% of the worst delays occur during weekdays and almost half of the delays (46%) occur in the weekday peaks

-4 -3 -2 -1 0 1 2 3 4

A27/A259 Portsmouth - Hastings

M4 J1 - J13

M1 J19 - J32

M62 J18 - A1

M1 J6a - J13

M25 J16 - J23

M25 J23 - J30

M25/A282 J30 - J7

M25 J7 - J16

M6 J8 - J20

Vehicle seconds delay (billions)

PSA Baseline Total Delay above 90th %ile Journey Time by Route for the worst ten routes

Baseline Headlines

Baseline Headlines

Average vehicle delay for the 10% worst journeys on the network

3.51 3.49 3.47 3.50 3.54 3.59 3.60 3.62 3.64

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Aug 04 -Jul 05

Sep 04 -Aug 05

Oct 04 -Sep 05

Nov 04 -Oct 05

Dec 04 -Nov 05

Jan 05 -Dec 05

Feb 05 -Jan 06

Mar 05 -Feb 06

Apr 05 -Mar 06

Ave

rage

Veh

icle

Del

ay

(min

utes

per

10

vehi

cle

mile

s)

Baseline Variation of Veh Delay

0.02

0.08 0.090.11

0.12

-0.02 -0.04 -0.020.00

-0.15

-0.10

-0.05

0.00

0.05

0.10

0.15

Aug 04 -Jul 05

Sep 04 -Aug 05

Oct 04 -Sep 05

Nov 04 -Oct 05

Dec 04 -Nov 05

Jan 05 -Dec 05

Feb 05 -Jan 06

Mar 05 -Feb 06

Apr 05 -Mar 06

Min

utes

del

ay p

er 1

0 ve

hicl

e m

iles

abov

e/be

low

ba

selin

e

3.51

Implications for HA of journey reliability target

• Focus on managing in real time and preventing major incidents

• Focus on improving the routes with the worst journeys experienced by greatest number of road users

• Improving quality of customer information and influencing travel behaviour to minimise unnecessary delays

Improving Reliability• Various areas of work being undertaken with

the overall aim of improving reliability:• Traffic Officer Service & Traffic Incident

Management• Better co-ordination of roadworks • Customer information• Investment in technology

• PSA target will act as a spur, ensuring that this work is focused on delivering the best possible outcomes for our customers.

Safety• Continue to maintain the network in safe and

serviceable condition. • PSA target for road safety:

• 33% reduction in ”killed or seriously injured”• 10% reduction in rate of slight casualties• Contribute to national 50% reduction in child

casualties

• Road worker safety.

Safety

1500

2000

2500

3000

3500

4000

1996 1998 2000 2002 2004 2006 2008 2010

Year

num

ber

of c

asua

lties

Actual Target Target+/-5%

Killed & Seriously Injured baseline 1994-98

Any Questions?

Thank You