US 9, NY 149, and US 4 from I-87 Exit 20 to the Vermont line is one of the most glaring ones in Upstate New York. I have seen long backups in both directions, especially during the summer. It's never gonna happen, as NY 149 can't be widened without an amendment to the state constitution if any of the necessary ROW within Adirondack Park lies on state land. This is a case where AADT doesn't say everything, as the AADTs are off-season. Summer counts on NY 149 just east of Warren CR 7 are generally in the 12-15,000 range, weekend counts on busy ski weekends are probably a little less. The US 9/NY 149 concurrency is upwards of 20,000 in the summer. All of these have relatively high truck percentages, as it is one of the main truck routes to western Vermont. The 149/7 count was 29% trucks.