MDTA has swapped out the gantries on the I-95 Express Toll Lanes north of Baltimore. The new ones are not terribly different from what was there before, save for the lighting systems, which are not on at all times, and appear to be some sort of matrix of LEDs. The E-ZPass readers are similar to what was there before, though they have a slightly different look from the old ones. This is related to upgrading of all electronic toll collection systems on all of Maryland's toll roads (not sure if they readers on the HWN Bridge on U.S. 301 will be upgraded or not, since the entire bridge will be replaced with a new one with all-electronic toll collection).
I saw the new toll collection hardware in place last night, as they were wrapping-up the work (MD-200 westbound between MD-650 and MD-182). The gantry structure itself is not changed,
but the overhead equipment looks just like what MDTA installed on the I-95 Express Toll Lanes
north of Baltimore including LED arrays that are always lit facing the front and rear of
passing traffic. It appeared to take them about 48 hours to get the work done (but they
may have been disrupted and delayed by the heavy rain that fell Friday night and Saturday
morning).