There is no noise when driving straight down the road. The noise is likely coming from the outer joints on the front drive axles. These flexible joints are located just inside the front wheels. Normally these joints operate in grease, but a torn protective boot can cause water and dirt to enter the joint. Several balls inside the joint connect the inner part of the joint to the outer part.
Dirt causes a groove to be worn in the channels the balls sit in.
There is no noise in a straight line because the balls remain in the worn groove, but when you turn a corner the balls must travel along the channel from one side to the other as the joint flexes. The balls pass over the worn spot and make a clicking sound as they move. The only cure for this problem is to replace the joints. To prevent the problem from re-occurring, have the rubber boots covering the joints inspected every time the car is serviced and replace the boots when the first signs of cracks appear. More articles by Jim Kerr Jim Kerr is a Master Automotive mechanic and teaches automotive technology.