Variable Message Signs

Variable Message Signs
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Variable Message Signs

VARIABLE MESSAGE SIGNS, short for VMS.  The phrase “VMS” is referred to exclusively throughout the contents of this document.  However, other commonly used terms describing highway signs that can display different messages are found within National and New York State publication and policy documents.  Examples of these terms are as follows: 
“VMS” (Variable Message Sign) shall mean a device to display a variety of text messages to motorists traveling the Thruway.   It is a traffic control device that typically suggests motorists alter their driving in some manner and take appropriate actions.  A VMS is not typically used as a regulatory sign as recognized within the MUTCD. 
“CMS” (Changeable Message Sign) shall mean a non-static sign that supports a limited number of fixed messages.  An example would be the rotating drum sign used in E-ZPass operations.  This term is currently contained in the 2003 edition of the Federal MUTCD.  
“CEVMS” (Changeable Electronic Variable Message Sign) shall mean a changeable message sign of a digital/LED-LCD display type that conforms to Federal and State statutes.   
“DMS” (Dynamic Message Sign) shall mean a changeable message sign as part of the NTCIP (National Transportation Communication for ITS Protocol).  
“BOARDS” shall mean changeable message signs as used in the Authority’s Traffic Safety 

VMS Application 

Generally speaking, VMS is used to communicate in real-time with motorists.  VMS messages must address current conditions on the roadway by being dynamic, accurate, timely and understandable. When there are multiple requests to post VMS messages simultaneously, messages will be prioritized in the following order of importance: 
1. Incident Management/Public Safety 
2. Congestion Management/Motorist Guidance 
3. Construction/Maintenance Activity  
4. Special Events 
5. Environmental  
6. Law Enforcement Message 
7. Public Service Campaign

VMS Small Knowledge:
When using text, care should be taken that the text can be read at a sufficient distance. One rule of thumb is that the minimum reading distance (in metres) is about 5 to 6 times the letter height (in cm). For example: a 36-cm high letter can be read at a distance of about 200 m from the sign. 
When planning to install new VMS, authorities should know that the European VMS standard (EN 12966) is obligatory for all fixed VMS signs used in traffic applications. This is not yet the case for temporary or mobile VMS because the Construction Products Directive (CPD) is only valid for products that are in permanent use. An informative appendix of the European VMS standard (EN 12966) provides guidance in choosing the correct combination of the various items mentioned above.




Feather
• Ultimate optical performance – exceeding the highest optical classes according to EN 12966
• Conformity to EN 12966 : more than 100 class-combinations of different color , luminosity , contrast , beam width , pixel pitch , LEDs ,forward current , etc. have been tested and certified by SGS/INTRON.
•Cutting edge performance – Anti-aliasing for picture smoothing , Optical System , Optimized Pixel Density , True Type Fonts ,Display Luminance Intensity Regulation , Current Source Monitoring Technology , Surface Mount LEDs – provide extraordinary advantages over standard LED signs in situations where motorists have only a brief period of time to absorb and react to information.
• Any application , any size , any interface , and any housing execution ( front & rear access , walk-in ) – over 150 different modules available 
• Connectable to any existing system – certified and proven compliance with most widely use protocols (NTCIP , TCP/IP ,PROFIBUS , XML-OPC , etc. ) ,customization to any user protocol ( numerous examples of implemented projects )
• 100% customizable dimensions and pixel pitches
• Customizable as any other application-tailored display(size , pitch , optical proterties , consumption , service access , redundancy requirements , set of standardized accessories )


Specifications 

TECHNICAL  SPECIFICATIONS

Pixel pitch ( freely programmable VMS )

P10 / P12 / P16 / P20

Color

Monochromeduel-colorfull-color

Housing material

Aluminium or stainless Steel

Paint coating

Dust polyester paint polymerized at 230

Loads

EN 12899-1 : 2007

Deflections

EN 12899-1 : 2007

Impact resistance

Pass

Vibration resistance

Pass

Passive safety

EN12767


OPTICAL SPECIFICATIONS

Luminance

L2L3 ( according to EN 12966-1 )

Luminance ratio

R2 R3( according to EN 12966-1 )

Color

C2 ( according to EN 12966-1 )

Beam with

B1—B6 ( according to EN 12966-1 )

Uniformity

Pass

Visible flicker

90Hz


ELECTRICAL  SPECIFICATIONS

Input voltage

230Vac±15% , 50Hz

Electrical supply and limits

Pass

Electrical safety

HD 60364-4-443 and HD 638 S1

 

PHYSICAL  SPECIFICATIONS

Operating temperature range

T1 : -15 --  +60

T2 : -25 --  +55

Humidity

Up to 95%

Ingress protection rating (IP)

IP65

Resistance to pollution

D3 D4


EMC

Emission

EN50293

Immunity

EN50293


SYSTEM FUNCTION

Interfaces

RS232RS485EthernetGPRS3G

Brightness Control

256 level (automatic or manual)

LED error detection

Open – circuit and Short - circuit

Sensor

Temperature Sensor Humidity Sensoretc.

Certification

CERohs


CASES