区間

1. Origins, structure, and basic meaning

• Structure: 区間(くかん) is a noun for a bounded section, such as the stretch between two points.
• Basic usage: It is used for sections of roads or railways when discussing access, distance, terrain, and similar features.

2. Common pitfalls and similar expressions

• The start and end points
  • In A駅からB駅までの区間, から and まで mark the two ends of the section. の connects that whole span to the noun 区間.
• 区間 and 期間
  • In a roadworks context, 区間 is the stretch of road affected, while 期間(きかん) is the duration of the work. In この区間は夜間通行止め, the part of the road and the time of the closure are separate pieces of information.