I likewise was held up in the panhandle of Texas west of Amarillo and once in New Mexico, boom the road was cleared. Now, NM is not noted for being the best about I-40, but it is all dependent where trucks are staged at the start of a bad storm.
It was hilly in Texas as well which made the poor clearing much more problematic for the drivers at speed.
Once one lane is covered, all avoidance options are gone.
...but we can still do 75 in the clear lane, right?