I was on Route 85 this past summer, just on a regular day, and already then, the traffic was horrendous & at a standstill for hours.
I always avoid big crowds, so would never go to Meron on Lag b’Omer. & now even more so after what happened at a huge crowd dispersed over a huge area in Boston on April 15, 2013, I surely would not go to Meron on Lag b’Omer which also is a huge crwod dispersed over a huge area.
If something about Route 85 isn’t done very imminently, there is going to be a mass Chilul Shabbos on Route 85 during 2021 & 2025, when Lag b’Omer occurs on a Friday.