Below is a short list of some common questions. Just click on the heading to expand.
As of 6.4 (November 2016), GRIDSMART computes normalized speeds without resorting to complicated, error-prone, and potentially dangerous camera calibration methods. The user enters the approximate free flow speed for each zone in its Zone Options dialog. The free flow speed is usually the posted speed limit or higher. The default value is 40mph, or 40kph if metric units have been selected in the Site Settings.
Raw, uncalibrated speed estimates are subject to significant bias from very small camera tilt and/or very subtle road surface deviations from level. Such bias can be corrected statistically using a known, approximate free flow speed.
GRIDSMART observes the zones over a learning period of 14 days and equates the raw free flow speed during that time to the user-entered free flow speed to compute a normalization factor. The raw calibration free flow speed from the first 14 days, along with the most recent free flow speed over the last 14 days, are both recorded in each count line as noted in the count file documentation. Speeds written to the realtime data files and/or returned by the realtime data APIs are already normalized. Note that the computed normalization can be applied to generate accurate speed reports on historical data. Also note that a value of -1 for any speed data element means that no speed data is available.
Speed reports, available with the Performance Module, are done by cycle for stop-line zones - i.e., those with assigned phases - with a user configurable Start-Up Lost Time. For zones without assigned phases, the speed reports are presented using the selected time interval. No data is shown for cycles or intervals with less than 3 measurements. Speed reports are not shown for zones without allowed thru movements. IMPORTANT NOTE: Reports run before the calibration period is complete may show uncalibrated speed data. These may present as unreasonably low or high speeds and may only affect a single approach. Please wait until the calibration is complete and re-run the report(s).
The front panel display relays a small but useful set of operational information, including current phases and calls when wired to the cabinet. See the Front Panel page for more information.
100 meters (328 feet) without a repeater. The cable can be extended twice, up to a maximum of 300 meters (984 feet) using two GRIDSMART repeaters. Note that the GRIDSMART repeater is powered by POE (Power Over Ethernet) and does not require external power. This is required so that the repeater will power cycle when the GRIDSMART Processor power cycles the camera ports.
The GRIDSMART Processor runs Windows Embedded.
Set a static IP on the GRIDSMART Processor's "Network Switch" adapter connection using VNC or by connecting a VGA monitor and a USB keyboard and mouse directly to the Processor. You cannot set a static IP address using the GRIDSMART Client. DO NOT CHANGE any properties for the local "DO NOT MODIFY" (or Private) connection. If you change this, the Processor will no longer operate correctly.
To set a static IP:
- Go to Start - Control Panel - Network Connections.
- Right-click on "Network Switch" (could also be named Network or Public on older units) and select Properties to get to the network properties window.
- Use the slider to drop down to Internet Protocol (TCP/IP) and highlight it. Then select the Properties button.
- Select "Use the following IP address" and enter appropriate static IP address information as provided by your local IT.
Proper cabinet and camera grounding is critical. Use of the GS-3-SMC2 Smart Connect box is also highly recommended for additional surge protection and an isolated earth ground. Additionally, an Ethernet Protection Module (EPM) will help protect from surges between the cameras and the GRIDSMART Processor. Additional information can be found under Design and Installation Guides in the Resources.
.xls (Excel 97-2003)
.rtf (Rich Text File)
.mhtml (web archive)