You could create a new numeric field in your attribute table of the "distance" based on the traffic counts. I would apply a distance (in meters, i.e. 10, 20, 30... etc.) which you could then use as the field for the buffer distance when you perform the buffer tool. For example: 1 - 10,000 = 10 10,000 - 20,000 = 20 20,000 - 30,000 = 30 ... the divisions are entirely up to you and what works well with your data.
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