21651 (a) Whenever a highway has been divided into two or more roadways by means of intermittent barriers or by means of a dividing section of not less than two feet in width, either unpaved or delineated by curbs, double-parallel lines, or other markings on the roadway, it is unlawful to do either of the following:

(1) To drive any vehicle over, upon, or across the dividing section.

(2) To make any left, semicircular, or U-turn with the vehicle on the divided highway, except through an opening in the barrier designated and intended by public authorities for the use of vehicles or through a plainly marked opening in the dividing section.

21651 (a) 高速公路被间歇性障碍物或宽度不少于 2 英尺的分隔段分隔为两条或多条道路时，无论是未铺砌的，还是由路缘石、双平行线或其他道路标线，下列行为均属违法：

(1) 驾驶任何车辆越过、越过或越过分隔部分。

(2) 车辆在分隔的高速公路上进行任何左转弯、半圆形转弯或掉头，除非通过公共当局指定和打算供车辆使用的障碍物上的开口或通过分隔路段上明显标记的开口.