Heading into midtown via Spur 527 today, I noticed that the old 35 mph speed limit sign had been replaced with a (tiny) 50 mph speed limit sign.
Perhaps complaints over the sneaky Spur 527 speed traps finally motivated TXDOT to get the new signs up.
Most of the exits are still 35 mph, so watch yourselves.
UPDATE: On the side of the Spur heading ON to Southwest Freeway, the posted speed limit is still 35 mph.