An improper turn doesn’t have to do whether the turn itself was legally allowed. The violation has to do with how the turn was executed.
The most important take away is that left and right turns need to be made from as far to the left and right of the roadway as practicable. There is also language regarding two way roadways and u-turns.
A conviction for the traffic violation carries two points.
It’s a pretty straight forward section of law and here’s the entire relevant section of the NYS VTL.
§ 1160. Required position and method of turning at intersections. The driver of a vehicle intending to turn at an intersection shall do so as follows:
a) Right turns. Both the approach for a right turn and a right turn shall be made as close as practicable to the right hand curb or edge of the roadway or, where travel on the shoulder or slope has been authorized, from the shoulder or slope.
(b) Left turns on two-way roadways. At any intersection where traffic is permitted to move in both directions on each roadway entering the intersection, an approach for a left turn shall be made in that portion of the right half of the roadway nearest the center line thereof and by passing to the right of such center line where it enters the intersection and after entering the intersection the left turn shall be made so as to leave the intersection to the right of the center line of the roadway being entered. Whenever practicable the left turn shall be made in that portion of the intersection to the left of the center of the intersection.
(c) Left turns on other than two-way roadways. At any intersection where traffic is restricted to one direction on one or more of the roadways, the driver of a vehicle intending to turn left at any such intersection shall approach the intersection in the extreme left-hand lane of the roadway lawfully available to traffic moving in the direction of travel of such vehicle or, where travel on the shoulder or slope has been authorized, from the shoulder or slope, and after entering the intersection the left turn shall be made so as to leave the intersection, as nearly as practicable, in the left-hand lane lawfully available to traffic moving in such direction upon the roadway being entered.
(d) When markers, buttons, signs, or other markings are placed within or adjacent to intersections and thereby require and direct that a different course from that specified in this section be traveled by vehicles turning at an intersection, no driver of a vehicle shall turn a vehicle at an intersection other than as directed and required by such markers, buttons, signs, or other markings.
(e) U-turns. U-turns shall be made from and to that portion of the highway nearest the marked center line. Where more than one lane of a highway has been designated for left turns, U-turns shall be made only from the lane so designated that is adjacent to the marked center line.