The shogunate, always suspicious of people on the move, maintained a system of garrisons along the road, and no one went through without an official pass.
The shogunate put garrisons on the road to keep people from passing.
mnli hypothesis: The shogunate put garrisons on the road to keep people from passing. premise: The shogunate, always suspicious of people on the move, maintained a system of garrisons along the road, and no one went through without an official pass.