Sudden stall and loss of acceleration with no indication?

This morning, my car seized in the middle of the feeder. When I pulled off to stop and investigate, it lost all acceleration, and the steering became rigid and immovable. I parked, and turned the vehicle off, restarted it with no issues doing so, but now it shows all the gear lights simultaneously, and won't accelerate over 15 - 20 MPH when I attempt to drive. I've stopped, so it's not being pushed any further. I just had an oil change done, and it didn't need any work before. Is there any indication as to what could be happening? This car is old, and has 275,000+ miles on it, as well.