Counting turning movements
- June 16, 2015 at 11:51 am #3133
Is there a method of tube installation which will accurately capture turning movements?June 17, 2015 at 9:00 am #3139
Turning movement counts have been conducted with MetroCount units in the past under certain optimum conditions, but this is not a commonly supported application of our equipment.
With enough data points on the approaching roads and in the intersection itself capturing turning counts, enough information can be obtained to produce a reasonable overall turning movement count. Classification of turning vehicles, however, generally requires estimation (which could be based on additional surveys of the intersection), as obtaining accurate classifications of turning vehicles directly is generally impractical.
The specific set-up for a turning count depends on the lane configuration so varies greatly from one intersection to the next.
On low volume intersections, it would be possible to monitor all entry and exit points of an intersection and use some filtering to obtain results. As previously stated, this is not a supported application of our products and would require a level of customisation to suit different situations.
The below image is an example of a real life situation where 8 MetroCount units were used to conduct a turning count. As you can see from the configuration of singular tubes in the intersection, the survey was purely for count without classification.
The results have not been independently verified so levels of accuracy are not assured.
If you would like us to examine any particular location using Google maps, for example, and advise whether we believe a reasonable count could be obtained, we’d be happy to assist. We can also provide a consulting service to assist with the analysis and reporting process.
June 19, 2015 at 2:05 am #3160
I’m sorry, I was not specific. The intersection is “T” type where a left turn is prohibited. The department is only interested in the illegal turns. If I “set” the Metro Count with “A” tube first and deploy “A” across the access street ( the “I” of the “T” ) and “B” across the roadway to the left (the prohibited turn), only those vehicles crossing “A” would be counted when they crossed “B.” B to A would not be counted and B only would not be counted. If my logic is correct the device would only count those vehicles crossing both A and B, in that order.June 30, 2015 at 9:35 am #3189
Would it be possible to get a sketch of the intersection with your proposed tube configuration and we can provide further info? Possibly a google maps link to the intersection?
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