 While driving in a 25 mph school zone, my steering wheel locked making it impossible to control my car on a curvy road after having just made a right turn, as I begun to pick up speed, my steering wheel remained in the position placed in order to follow the curve, locking immediately after. My initial reaction was to try unlocking the steering, but it didn't budge; I hit about 3 concrete median blocks, before drifting into an uneven field of grass; luckily, there was a sewage manhole jolting out from the ground managing to slow down my car before I was able to pull the emergency break. If this would've occurred in high traffic, there could've been several casualties, including my own.