Pro-Tip | Using Multiple Classification Schemes
With class schemes, it’s never quite a ‘one size fits all’ situation. A classification scheme with a high degree of heavy vehicle separation might prove less useful for summarizing traffic. Similarly, standardized schemes mandated for pavement management may lack detail on low impact vehicles like bikes and motorcycles.
MTE™ makes it simple to analyze any data file, using a variety of classification schemes, without ever affecting the underlying data. MTE includes a number of standard class schemes, with flexibility for the creation of custom schemes. For data resulting from tube or piezo counters, schemes are based on number of axles, axle spacings and groupings. Loop counters only use vehicle length for classification.
So how do we make use of different class schemes?
When setting up MTE, users select a default scheme that is applied in the Profile filtering section. To change the scheme, simply check the Scheme box on the profile page and browse the available options. To view detailed information on each scheme, including definitions, click the details dialog and view the classes tab.
Within each scheme, it is possible to toggle certain classes on or off. For example, to use the VRX scheme and exclude cyclists, you should click the Class dialog box in the Profile window and uncheck the 15 Cycle class. With this method, you can analyze speeds, volumes and other statistics for a data subset.
Some schemes have the option to aggregate classes to view general groupings of vehicles. For example, in the Swedish 2 class scheme, the Aggregate selected class scheme dialog box will group the predefined 14 classes into 3 general classes: Light, Medium and Heavy.
Multipurpose Classification Schemes
VRX Scheme: VRX was developed by MetroCount as a multipurpose scheme for analyzing classes from bicycles right through to heavy vehicles. Based on the Australian standard, AustRoads94, this new scheme also includes bikes and motorcycles. The cycle class in VRX is an aggregate of class 1 (cycle) and class 2 (co-cycle) defined in the Shared Path (MTE V5).
Cycling Specific Class Schemes
We recommend always staying up to date with the latest MTE version, and particularly for analyzing bike data. Our bike schemes distinguish individual cyclists from groups of cyclists riding along the sensors (co-cycle). This separation allows users to choose when to include or exclude cyclist clusters. For example, counting grouped cyclists is necessary for volume analysis, but may reduce the accuracy of speed and directional analysis.
Shared Path Scheme: In MTE V5 introduces a new cycling scheme which supersedes the 5720 Cycle Scheme from MTE V4. The latest Shared Path Scheme improves the classification by including bike length up to 1.18m as opposed to the previous 1.15m limit.
Saving Settings For Future Use
Any modifications to the Profile screen can be saved for later use. This is particularly useful when frequently switching between class schemes with different default settings. For example, when using VRX you might want to include traffic below 10km/h to capture slow moving bikes, but when using AustRoads94 you would exclude these speeds.
Setting a new default profile to your most commonly used settings also saves time in making changes each time you analyze a dataset.
As always, if you have further questions, post a comment below or contact our friendly staff.
If you don’t have the latest version of MTE (Version 5), get in touch to find out if you are eligible for a free upgrade.