The department is authorized to divide or separate any state highway into separate roadways, wherever there is particular danger to the traveling public of collision between vehicles proceeding in opposite directions or from cross traffic, by constructing curbs, central dividing sections, or other physical separations, or by signs, marks, or other devices, in or on the roadway appropriate to designate the dividing line.
The rules governing operation of vehicles on divided highways are contained in Section 21651 of the Vehicle Code.
90
90.1
91
91.2
91.5
91.6
91.8
92
92.2
92.3
92.4
92.5
92.6
93
94
94.3
94.4
95
95.5
95.6
96
97
97.01
97.1
97.4
100
100.1
100.2
100.3
100.5
100.6
100.7
100.9
100.21
100.22
100.25
100.45
100.51
101
101.1
101.2
101.3
101.4
101.5
101.6
101.7
101.8
101.9
101.10
101.11
101.12
101.13
101.14
102
103
103.5
103.65
104
104.2
104.4
104.5
104.6
104.7
104.8
104.9
104.10
104.11
104.12
104.13
104.15
104.16
104.17
104.18
104.19
104.21
104.22
105
106
107
108
109
109.5
110
111
111.5
112
113
113.5
114
115
116
117
118
118.1
118.5
118.6
118.7
119
120
121
122
123
123.5
124
124.1
125
127
128
129
130
130.1
130.2
130.5
131
131.1
131.5
132
134
134.5
135
135.3
135.4
135.5
135.6
135.7
136
136.1
136.5
136.6
137
137.6
138
139
140
140.3
140.5
141
142
143
143.1
144
144.5
145
146
146.5
147
148
148.1
149
149.1
149.3
149.4
149.5
149.6
149.7
149.8
149.9
149.10
149.11
149.12
150
151
152
153
154
154.1
155
155.5
155.6
90.1
91
91.2
91.5
91.6
91.8
92
92.2
92.3
92.4
92.5
92.6
93
94
94.3
94.4
95
95.5
95.6
96
97
97.01
97.1
97.4
100
100.1
100.2
100.3
100.5
100.6
100.7
100.9
100.21
100.22
100.25
100.45
100.51
101
101.1
101.2
101.3
101.4
101.5
101.6
101.7
101.8
101.9
101.10
101.11
101.12
101.13
101.14
102
103
103.5
103.65
104
104.2
104.4
104.5
104.6
104.7
104.8
104.9
104.10
104.11
104.12
104.13
104.15
104.16
104.17
104.18
104.19
104.21
104.22
105
106
107
108
109
109.5
110
111
111.5
112
113
113.5
114
115
116
117
118
118.1
118.5
118.6
118.7
119
120
121
122
123
123.5
124
124.1
125
127
128
129
130
130.1
130.2
130.5
131
131.1
131.5
132
134
134.5
135
135.3
135.4
135.5
135.6
135.7
136
136.1
136.5
136.6
137
137.6
138
139
140
140.3
140.5
141
142
143
143.1
144
144.5
145
146
146.5
147
148
148.1
149
149.1
149.3
149.4
149.5
149.6
149.7
149.8
149.9
149.10
149.11
149.12
150
151
152
153
154
154.1
155
155.5
155.6