Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Manuale Utente Scaricare il pdf (Pagina 8)

INTRODUCTION  SMARTSENSOR ADVANCE USER GUIDE 7

Note

For queue management the SmartSensor Advance Extended Range is recommended

because it allows you to see a greater range and also provides a view of the stop

bar. The SmartSensor Advance Extended Range is also recommended for wrong-way

detection applications. Contact Wavetronix Technical Services for more information.

If your application is dilemma zone protection and/or truck signal priority, SafeArrival™

technology is recommended because it provides signicant safety and eciency advan-

tages when compared with traditional point-based protection. Conguring SafeArrival

technology for dilemma zone protection is as simple as selecting the arrival times, ranges

and speeds that are unsafe and warrant protection. Conguration SafeArrival technology

for truck signal priority requires the additional conguration of the truck discovery range

threshold available with SmartSensor Advance Extended Range.

For green extension, arrival times between 2.5 and 5.5 seconds, ranges from 100 to 500 .

(30.5 to 152.4 m) and speeds above 35 mph (56 kph) are generally considered unsafe for

passenger vehicles. For truck signal priority, arrival times between 2.5 and 7.5 seconds,

ranges from 100 to 900 . (30.5 to 274.3 m) and speeds above 35 mph (56 kph) are generally

considered unsafe for trucks, buses and other large vehicles.

However, engineering judgment needs to be used in selecting these parameters. For ex-

ample, 2.5 to 5.5 second arrival times are nominal values based upon general 10% and 90%

stopping probabilities. Your agency may suggest protection of slightly dierent arrival times

for a particular type of high-speed approach.

It may be helpful to consult your agency’s guidelines to verify which trac conditions war-

rant protection at your intersections. Location of point-detection zones, passage time and

design speed can oen be used to discover the arrival times and ranges that warrant protec-

tion. In addition, the minimum speed that would warrant installation of a dilemma zone

protection system may be used as a guideline for the lowest speed to be protected.

If you elect not to use SafeArrival technology, you can also congure SmartSensor Advance

to match your agency’s loop-based dilemma zone protection guidelines. Before doing so, it

is recommended that you explore the benets provided by SafeArrival technology in detail.

Selecting a Mounting Location

Consider the following guidelines when selecting a mounting location:

 Detection coverage – Position the sensor so that it will be able to reach all the speci-

ed advanced detection zones. Also consider that the sensor will track vehicles as they

enter and exit desired detection zones. Accordingly, the sensor will oen work better if

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Wavetronix SmartSensor Advance Extended Range (SS-200E) - Use Manuale Utente Pagina 8