"You must be able to come to a safe stop in the distance you can see, in only your lane, without drama (no locked wheels, ABS engagement, etc.)." Pretty much the best definition of how you should drive on the roadway. If you come up to a turn, make sure your entry speed will allow you to stop in the distance you can see to be clear. As the turn opens up and you can see more road, you can accelerate back up to the speed limit if you had to decelerate for your entry. There is absolutely nothing wrong with staying at a steady speed through the turn either and then accelerating once you're out of the curve, so long as you can stop in the distance you can see. The speed limit on a given piece of road will be below that of the turning capabilities of most vehicles for a given turn, so accelerating or a steady throttle out of the curve really doesn't matter, you're not using all the traction of your tires anyway. Being able to "safely" negotiate a turn at speed is a false sense of security. Doing it truly safely means being able to negotiate it in a manner that keeps you AND the rest of the motoring public (including the guy going the opposite way who thought he could "safely" negotiate the turn at high speed) from being involved in an accident.

The following applies to the TRACK ONLY!!! Accelerating puts grip to the rear, not where you need it when turning. If you are able to accelerate through the turn (not just on the exit) you are coming in far below the speed you should be at for the turn entry. Ideally at the most advanced level, you brake until it's time to turn, gradually add in more the wheel and release the brake, then once you're completely off the brakes you'll be at max wheel input, and then it's time to start taking the wheel out and adding in the gas until right as you straighten out you are at max acceleration. This allows you to balance the steering, braking, and acceleration needs of the car against the available traction of the tire. However if you screw this up you'll either fail to fully use the traction of the tire, or over use it (slow or out of control). For most people it's more consistent, to straight line brake until turn in (all traction to braking), turn (all traction to turning), and then get on the gas once you're straightened out (all traction to acceleration).

-Jenrick