They were really "Traveling Too Slow" once he stopped them.
Think of the logistics. Travel the side streets with a traffic light at every corner with the chances of a 100 car procession getting split up into 5 pieces. That would need 5-7 off duty officers getting extra pay from the funeral home (and bereaved).
OR, pay 2 officers, a lead and a chase for on the freeways and when they hit traffic lights (now much less of them) leapfrogging along alternating.....you can’t keep that up for a couple dozen traffic lights and with a chase LE with lights it doesn’t make much huhu on the freeway......