GRIDSMART records turning movement counts based on the direction an object travels with respect to the flow arrow of the last exited zone. This means that dual-use (e.g., thru and right) zones can be counted accurately and that u-turns from left turn zones can be counted.
Because of this, however, you may have dedicated right turn lanes (or left turn lanes for left-side driving locales), where vehicles entering and exiting the zone are already traveling in the turn direction rather than the approach direction. In such cases, as noted in this Issue, you may find that GRIDSMART labels many of those counts as thru movements rather than right turns.
To address this for dedicated, free-flow right turns, you should point the zone flow arrow in the approach direction, rather than in vehicle travel direction, and turn on left side entry as indicated in the image below.