pinch point
noun /ˈpɪntʃ pɔɪnt/
  /ˈpɪntʃ pɔɪnt/
- a place or point where problems can occur because things are really busy, especially on a road
- When traffic builds up, the spot becomes a dangerous pinch point.
 - There are always strains and pinch points when it comes to allocating scarce resources.