A remote pilot is operating at 300 feet AGL in Class G airspace and notices a Military Training Route on the sectional chart passing nearby. What is the primary hazard these routes present to sUAS operations?

Why →Military Training Routes are designed for high-speed, low-altitude training flights. Aircraft on these routes may fly at or below 1,500 feet AGL at speeds that allow very little reaction time. Unlike commercial air traffic at altitude, these aircraft may be in the same airspace a drone occupies. The drone's small size makes it very difficult for military pilots to visually acquire it at high closure speeds.

The trap →MTRs are not controlled airspace and do not require authorization. The hazard is physical: high-speed traffic at low altitude, not a regulatory restriction.

Field note →If an MTR passes through or near your planned operations area, check its scheduled activity in the Chart Supplement and file a NOTAM check. If the route is active during your planned window, consider a different location or time.