Most Dangerous Roads in California

#	Road	Crashes	Fatalities	Fatal / 1k
1	US-101	23,695	70	3.0
2	I-5	21,278	60	2.8
3	I-10	14,858	16	1.1
4	I 80	11,823	34	2.9
5	I-405	10,482	2	0.2
6	I 15	10,101	32	3.2
7	SR-99	9,340	33	3.5
8	SR 60	7,478	8	1.1
9	I-880	6,490	20	3.1
10	SR 91	6,298	0	0.0
11	I-210	5,332	8	1.5
12	I-110	4,690	2	0.4
13	I 215	4,591	2	0.4
14	I-580	3,723	24	6.4
15	I-280	3,670	18	4.9
16	US-50	3,619	17	4.7
17	SR-1	3,406	43	12.6
18	MAIN ST	3,240	23	7.1
19	I-605	3,232	1	0.3
20	I-680	3,078	13	4.2
21	I-710	2,701	0	0.0
22	SR 14	2,597	6	2.3
23	SR-210	2,583	3	1.2
24	US 101 NORTHBOUND	2,552	14	5.5
25	US 101 SOUTHBOUND	2,543	29	11.4

California's most dangerous roads by crash volume are concentrated in the Southern California megalopolis. Interstate 5, Interstate 405, and Interstate 10 carry the highest absolute crash counts because they are among the busiest freeways in the United States — often exceeding 350,000 vehicles per day in their most congested segments. High traffic density produces frequent rear-end collisions, side-swipes, and merge-zone crashes even at relatively modest speeds.

Roads that rank high on fatality rate — fatal crashes per 1,000 total crashes — tend to be different corridors entirely. State Route 99 through the Central Valley, US Highway 101 through coastal and inland segments, and rural two-lane state routes operate at highway speeds but lack the median barriers, lighting, and emergency response infrastructure of urban freeways. A single errant crossing-of-center on SR-46 or SR-33 is far more likely to be fatal than a rear-end collision at 15 mph on the 405.

Speed is the primary collision factor in nearly all fatal crashes statewide. The California Highway Patrol reports that speed-related crashes account for roughly 35–40% of all traffic fatalities each year. Impairment and distracted driving are the next most common factors, followed by failure to yield right-of-way. Pedestrian fatalities are heavily concentrated on arterial streets, not freeways — surface streets with mixed traffic, frequent crossings, and variable speeds produce disproportionate pedestrian deaths relative to their total crash counts.

The rankings on this page cover crashes recorded by the California Highway Patrol or submitted by local law enforcement to the California Crash Records System (CCRS) since January 2024. Only investigated, completed crash reports are included. Minor property-damage crashes not reported to law enforcement are excluded, which slightly underrepresents crash totals on lightly patrolled rural roads.