Casualties and collisions by speed limit and road length, Bristol: 2021 to 2025
Speed Limit (mph)	Collisions	Fatal	Serious	KSI	Slight	Total length (km)	% of LA roads	Collisions per km	Fatal per km	Serious per km	KSI per km	Slight per km	Fatal per collision	Serious per collision	KSI per collision	Slight per collision
20	2392	6	600	606	2003	724.5	58.3	3.30	0.01	0.83	0.84	2.76	0.003	0.251	0.253	0.837
30	1442	18	390	408	1269	152.0	12.2	9.49	0.12	2.57	2.68	8.35	0.012	0.270	0.283	0.880
40	213	6	60	66	197	51.6	4.2	4.13	0.12	1.16	1.28	3.82	0.028	0.282	0.310	0.925
50	12	0	5	5	10	2.1	0.2	5.71	0.00	2.38	2.38	4.76	0.000	0.417	0.417	0.833
60	2	0	1	1	1	4.2	0.3	0.48	0.00	0.24	0.24	0.24	0.000	0.500	0.500	0.500
70	41	2	13	15	48	27.4	2.2	1.50	0.07	0.47	0.55	1.75	0.049	0.317	0.366	1.171
Source: DfT STATS19 and OSM