Fields - Brush - Tall Grass TEC

[Coniglius]

Hmmm... I might be able to weigh in here, as I have intimate knowledge of such a condition. During my time in A'Stan (one year, so I saw the seasons change) we did a lot of work in the fertile river valleys where tall crops and fields would grow. In the Spring and Summer, this was particularly rough going due to the presence of these crops. Visibility was a challenge (we usually had Spotter Helos accompany us), hence 'limiting terrain', and the soft, tilled ground made movement difficult.
Conversely, in the winter months, visibility was no longer an issue, but the broken nature of ground that has been harvested still made for difficult foot movement. The tracks and heavier wheeled vehicles were not affected (Humvees were a bit uncomfortable in this terrain as you felt every single bump). So, as Rich states above, spotting is no longer an issue in the months following the harvest (clear terrain for spotting purposes... not limited whatsoever) but movement is still affected for all foot and wheeled vehicles (tracks are unaffected). That's how I would play it, based on my first hand experience.