inter-urban its john paddington, consultant, faber maunsell nottingham university, 24 th november...
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Inter-Urban ITSJohn Paddington, Consultant, Faber Maunsell
Nottingham University, 24th November 2005
Inter-Urban ITS, Nottingham University, 24th November 2005
Lecture Content
Why use ITS?
M25 Controlled Motorway
Active Traffic Management (ATM) on the M42
NASS Decision making tool for ATM
Inter-Urban ITS, Nottingham University, 24th November 2005
Inter Urban Network: Context
Focus on the road network Already near capacity
Building more roads is not the answer Environmentally damaging Politically sensitive issue
Inter-Urban ITS, Nottingham University, 24th November 2005
What is ITS?
ITS stands for Intelligent Transport Systems
Essentially modern technology used in conjunction with transport schemes.
Using existing infrastructure “better”
A recap
Image
M25 Controlled MotorwayVariable Speed Limits
Inter-Urban ITS, Nottingham University, 24th November 2005
MIDASFore-runner of Controlled Motorway
Image
Inter-Urban ITS, Nottingham University, 24th November 2005
Why Variable Speed Limits?
Lower traffic speeds when the road is busy to reduce congestion
Aim to improve efficiency of the road Reduce “stop / start” traffic
More consistent journey times Reduce variability
Some theory…
Inter-Urban ITS, Nottingham University, 24th November 2005
What is Controlled Motorway?
Development of MIDAS
Mandatory Variable Speed Limits (60, 50 ,40 mph limits)
Speed Enforcement Initially wet film cameras Now Digital Gatsos
The System
Inter-Urban ITS, Nottingham University, 24th November 2005
M25 Controlled Motorway:
M25 CM Picture
Inter-Urban ITS, Nottingham University, 24th November 2005
Controlled Motorway
Parties involved: Highways Agency TRL Mouchel Parkman
Faber Maunsell have been involved since 1999!
Faber Maunsell Involvement in the Project
Inter-Urban ITS, Nottingham University, 24th November 2005
Controlled Motorway
Business Case Development
Assess benefits: Journey Time Accident Savings Fuel Saving
Assess costs: Installation, Renewal and Maintenance
Scheme Assessment(1)
Inter-Urban ITS, Nottingham University, 24th November 2005
Controlled Motorway
Government Approach: (WEBTAG)
Assess wide range of benefits and disbenefits in the following categories: Environment Safety Economy Accessibility Integration
Produce a comparison table called an Appraisal Summary Table (AST)
See: www.webtag.org.uk for details
Scheme Assessment(2): WEBTAG
Inter-Urban ITS, Nottingham University, 24th November 2005
Controlled Motorway Scheme Assessment(3): Appraisal Summary Table
AST
Active Traffic Management (ATM)Controlled Motorway 2?
Inter-Urban ITS, Nottingham University, 24th November 2005
Active Traffic Management
M42 Junctions 3a- 7: Birmingham
Multi-Million pound project
Uses the latest technology
First phase going live imminently
The latest scheme
M42 J3a-7
Inter-Urban ITS, Nottingham University, 24th November 2005
Active Traffic Management
Access Control
CCTV Based Incident Detection
Emergency Refuge Areas
Hard Shoulder Management
HADECS Digital Speed Enforcement
MS4 Variable Message Signs capable of displaying pictograms
Not just Controlled Motorway…
Inter-Urban ITS, Nottingham University, 24th November 2005
Active Traffic Management The reality
ATM Picture
Inter-Urban ITS, Nottingham University, 24th November 2005
Active Traffic Management
Installation works now complete
Three Lane Variable Speed Limits from Late 2005
Four Lane Hard Shoulder Running from Autumn 2006
Access Control: still to be determined
Timetable
Inter-Urban ITS, Nottingham University, 24th November 2005
Active Traffic Management
Advert in Birmingham METRO:
Monday 21st November 2005
ATM Website: www.highways.gov.uk/atm
Education
Network ATM Supervisory Subsystem (NASS)A traffic management tool for ATM
Inter-Urban ITS, Nottingham University, 24th November 2005
What is NASS?
Computer modelling tool developed by IPL
Will be used by ATM Operators in the Control Room
Predicts traffic conditions an hour ahead
Match conditions to a library of traffic patterns
Decide which one of three associated plans will have the most benefit
Summary
Inter-Urban ITS, Nottingham University, 24th November 2005
What is NASS?A screenshot…
Image
Inter-Urban ITS, Nottingham University, 24th November 2005
What is NASS?
Working for WSP in Basingstoke
Ultimate client is the Highways Agency
Testing Phase B of the system “Offline” testing Phase C will be installed in the Control Room
Faber Maunsell involvement
Inter-Urban ITS, Nottingham University, 24th November 2005
What is NASS?
Used to simulate road conditions
“Graphical” modelling tool Each “dot” is a car! Colours show speed of each car
TRL SISTM Simulator
Image
Inter-Urban ITS, Nottingham University, 24th November 2005
NASS Testing
System run for six hour period From “6 am” to “12 am” Takes six hours for each run!
Assess Flows, Speed and Journey times across the network
Only two of thirty runs complete so far
Process
Inter-Urban ITS, Nottingham University, 24th November 2005
NASS ResultsAn example…
Journey times for Junction 3a to 4 Northbound
0
1
2
3
4
5
6
7
8
06:00 07:12 08:24 09:36 10:48 12:00 13:12
Time
Jou
rne
y ti
me
in m
inu
tes
Baseline Journey Times
Nass Run 1 Journey Times
Junctions 3a to 4 Speed-Flow Comparision
0
50
100
150
200
06:00 07:12 08:24 09:36 10:48 12:00 13:12
Time
Sp
eed
(kp
h)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
Flo
w (
veh
icle
s p
er h
ou
r)
Speed1
Speed2
Flow1
Flow2
Any Questions…
And as a reminder…We will be holding an informal session in Room B36 from 13:00 to 14:30
Anyone is welcome to “drop in” and to talk to any one of us.