History
Chaos
NEMA (TS 1)
170 (CALTRANS / NY)170E 179
470i
NEMA TS 2
2070
ATC
2070N
Memory Plug-in Others . . .
Electromechanical
In the beginning…..
Slide #3
Traffic Controllers Timeline
CM Uor
MM U
1940s 1976 1980s 1992
CM Uor
MM U
TS-2NTCIP
Electro-mechanical
NEMATS-1 170
NEMATS-2
2070ATC
1998 1990s
Slide #4
Electro-Mechanical Controllers
No standards in use No software needed Still exists, New York City,
Chicago, … ( New York has over 11,000)
Slide #5
NEMA TS 1 & TS 2 Controllers
Functional specification Includes vendor-dependent hardware & software Shelf mounted TS 1 standard pin-outs for A, B & C, but not D TS 2 provides for serial connection to cabinet Proprietary solutions for signal timing Wide variety of cabinet configurations
Slide #6
Type 170 & 179 Controllers
Hardware specification Software is provided by others Rack mounted with
standard modules Standard front panel Originally developed
by public sector Very low cost – QPL
approach Utilized older technology
Slide #7
Advanced Transportation Controllers
The ATC is attempting to bring these two competing standards together while preserving the best of both.
170 NEMA
ATC
Slide #8
ATC Program Goals
Interchangeability between manufacturers Assured source of competitively priced controllers Better adaptability to advances in technology Cost effective and modular construction Minimize the level of hardware detail Ensure interoperability within systems Provide well defined controller testing
requirements
Slide #9
ATC Program Goals (continued)
Open architecture Hardware and software platform Support for multiple ITS applications
Recoverable software investment Software portability between vendors / technology Enhanced availability of software applications
Flexible hardware platform Better adaptation to new technology Promotes expandability for power users
“Traffic control PC”
Slide #10
Potential ATC Applications
Traffic Signal Traffic Surveillance Transit Communications Field Master Ramp Meter Variable/Dynamic
Message Sign
General ITS Beacons CCTV Cameras Roadway Weather
Information Weigh in Motion Irrigation Control Lane Use Signals
Slide #11
The ATC Family of Standards
Controller Unit – 2070-ATC and the ATC Cabinet System Application Programming Interface (API) Application Software
Slide #12
NTCIP
National Transportation Communications for ITS Protocol (NTCIP) Device level data dictionaries Communications protocols for transmission
Based on existing standards Internet Protocols International Standards Organization (ISO) Open-
Systems Interconnection (OSI) layers Data element definition uses ASN.1 language
Slide #13
Message
DataDataElementElement
DataDataElementElement
Message Set Standards
Data Element Standards
Protocol Standards
DataDataElementElement
ITS
Stan
dard
s
DataDataElementElement
Communications
Slide #14
National ITS Architecture
Remote AccessSubsystems
Rem
ote
Tra
vele
rS
uppo
rt
VehicleSubsystems
Center Subsystems
Em
issi
ons
Man
agem
ent
Tra
ffic
Man
agem
ent
Em
erge
ncy
Man
agem
ent
Tra
nsit
Man
agem
ent
Tol
l Adm
inis
trat
ion
Fre
ight
& F
leet
Man
agem
ent
Com
mer
cial
Veh
icle
Adm
in
Info
rmat
ion
Ser
vice
Pro
vide
r
Wide Area Mobile
Arc
hive
d D
ata
Man
agem
ent
Roadside Subsystems
Roadway
Parking Management
Commercial Vehicle Check
Vehicle
Toll CollectionTransit
Emergency
Commercial
Per
sona
l Inf
orm
atio
nA
cces
s
Mai
nten
ance
& C
onst
ruct
ion
Fixed Communications
Maintenance & Construction
Sho
rt R
ange
Wire
less
Veh
icle
to
Veh
icle
Slide #15
Where do Traffic Signal Standards fit?
Remote AccessSubsystems
Rem
ote
Tra
vele
rS
uppo
rt
VehicleSubsystems
Center Subsystems
Em
issi
ons
Man
agem
ent
Tra
ffic
Man
age
men
t
Em
erge
ncy
Man
agem
ent
Tra
nsit
Man
agem
ent
Tol
l Adm
inis
trat
ion
Fre
ight
& F
leet
Man
agem
ent
Com
mer
cial
Veh
icle
Adm
in
Info
rmat
ion
Ser
vice
Pro
vide
r
Wide Area Mobile
Arc
hive
d D
ata
Man
agem
ent
Roadside Subsystems
Parking Management
Commercial Vehicle Check
Vehicle
Toll CollectionTransit
Emergency
Commercial
Per
sona
l Inf
orm
atio
nA
cces
s
Mai
nten
ance
& C
onst
ruct
ion
Maintenance & Construction
Veh
icle
to
Veh
icle
Actuated Signal
ControllerStandards
Roadway
Fixed Communications
Sho
rt R
ange
Wire
less
Slide #16
NTCIP Traffic Signal Standard
NTCIP defines communications standards applicable to traffic signal controllers
Users define controller specifications Users define system operational characteristics
Slide #17
List of Required Traffic Signal Standards
Dictionaries NTCIP 1201 – Global Object Definitions NTCIP 1202 – Actuated Signal Controller
Protocols NTCIP 2301 – AP-Simple Transportation Management
Framework (STMF) Profile NTCIP 2101 / 2102 – Subnet Profiles NTCIP 2201 / 2202 – Transport Profiles
Slide #18
Bringing Things Together
In general, NTCIP Uses modular standards Covers multiple devices Devices will need multiple compatible standards
Simply specifying “NTCIP-Compliant” is not enough…..