Fast And Safe :: Facts & Myths - Hidden Camera Trial

Explanatory notes

The LTSA carried out two separate groups of analyses. In the first, outcomes within 100km/h zones in Midland (see note 1) were compared to those in the rest of New Zealand. In the second, a similar comparison was done specifically for speed camera sites. In each of these groups, we carried out separate analyses for a) fatal and injury crashes and b) deaths and injuries resulting from crashes. This is reflected in the data structure below. For each of these four series, the data have been provided as a monthly timeseries. The change in camera operation (introduction of hidden cameras in the Midland region) took place in June - July 1997. See the paper provided earlier (Keall et al, 2001) for details.

Notes:
1. 'Midland': Former Midland Police region. This area includes the Waikato, Bay of Plenty and Gisborne Local Government Regions, plus the Wairoa District and has about 17% of the NZ population.
2. The model used included camera trial, trend and seasonal terms (see Keall et al, 2001).

Fatal and injury crashes in 100km/h zones			Deaths and injuries from crashes in 100km/h zones			Fatal and injury crashes at speed camera sites in 100km/h zones			Deaths and injuries in crashes at speed camera sites in 100km/h zones			Deaths from crashes in 100km/h zones
Month	Midland	Rest of NZ	Month	Midland	Rest of NZ	Month	Midland	Rest of NZ	Month	Midland	Rest of NZ	Month	Midland	Rest of NZ
Nov-93	59	262	Nov-93	96	458	Nov-93	10	72	Nov-93	15	110	Nov-93	15	28
Dec-93	79	252	Dec-93	134	425	Dec-93	7	74	Dec-93	11	109	Dec-93	20	18
Jan-94	69	245	Jan-94	146	440	Jan-94	10	52	Jan-94	24	99	Jan-94	12	19
Feb-94	54	269	Feb-94	90	424	Feb-94	6	54	Feb-94	8	85	Feb-94	9	18
Mar-94	69	277	Mar-94	118	440	Mar-94	11	75	Mar-94	25	124	Mar-94	15	31
Apr-94	72	244	Apr-94	117	411	Apr-94	9	61	Apr-94	16	103	Apr-94	12	14
May-94	51	284	May-94	102	496	May-94	12	76	May-94	18	140	May-94	13	15
Jun-94	60	265	Jun-94	92	441	Jun-94	5	68	Jun-94	5	128	Jun-94	9	19
Jul-94	56	298	Jul-94	96	504	Jul-94	10	85	Jul-94	13	157	Jul-94	9	31
Aug-94	57	251	Aug-94	92	412	Aug-94	7	80	Aug-94	11	144	Aug-94	11	28
Sep-94	59	258	Sep-94	107	414	Sep-94	8	53	Sep-94	23	81	Sep-94	8	27
Oct-94	62	273	Oct-94	114	449	Oct-94	11	67	Oct-94	18	127	Oct-94	8	29
Nov-94	71	268	Nov-94	110	429	Nov-94	12	67	Nov-94	25	94	Nov-94	8	27
Dec-94	90	314	Dec-94	154	522	Dec-94	7	75	Dec-94	11	133	Dec-94	13	39
Jan-95	80	280	Jan-95	169	479	Jan-95	17	52	Jan-95	36	88	Jan-95	10	27
Feb-95	70	239	Feb-95	124	391	Feb-95	4	53	Feb-95	6	85	Feb-95	11	26
Mar-95	69	288	Mar-95	117	439	Mar-95	14	63	Mar-95	29	86	Mar-95	10	18
Apr-95	62	326	Apr-95	90	493	Apr-95	9	83	Apr-95	10	129	Apr-95	7	26
May-95	68	304	May-95	103	470	May-95	9	95	May-95	14	138	May-95	20	17
Jun-95	57	263	Jun-95	94	397	Jun-95	13	69	Jun-95	23	106	Jun-95	4	11
Jul-95	66	282	Jul-95	133	454	Jul-95	12	67	Jul-95	15	116	Jul-95	21	18
Aug-95	73	259	Aug-95	130	398	Aug-95	9	62	Aug-95	16	84	Aug-95	12	18
Sep-95	90	256	Sep-95	146	386	Sep-95	13	73	Sep-95	32	104	Sep-95	8	29
Oct-95	80	272	Oct-95	124	424	Oct-95	13	70	Oct-95	21	113	Oct-95	9	18
Nov-95	79	290	Nov-95	131	450	Nov-95	12	73	Nov-95	21	122	Nov-95	5	26
Dec-95	127	340	Dec-95	239	587	Dec-95	22	80	Dec-95	47	147	Dec-95	21	31
Jan-96	93	266	Jan-96	177	450	Jan-96	10	62	Jan-96	14	108	Jan-96	7	19
Feb-96	70	252	Feb-96	114	408	Feb-96	14	57	Feb-96	26	92	Feb-96	2	24
Mar-96	85	270	Mar-96	146	433	Mar-96	16	57	Mar-96	30	103	Mar-96	10	24
Apr-96	81	238	Apr-96	131	403	Apr-96	11	50	Apr-96	20	88	Apr-96	5	18
May-96	74	250	May-96	120	366	May-96	17	68	May-96	31	98	May-96	17	12
Jun-96	84	261	Jun-96	157	416	Jun-96	14	74	Jun-96	26	117	Jun-96	15	30
Jul-96	56	213	Jul-96	94	342	Jul-96	5	61	Jul-96	6	100	Jul-96	4	18
Aug-96	65	231	Aug-96	112	359	Aug-96	13	45	Aug-96	22	69	Aug-96	12	15
Sep-96	71	208	Sep-96	126	327	Sep-96	5	44	Sep-96	10	71	Sep-96	4	18
Oct-96	71	229	Oct-96	140	360	Oct-96	8	57	Oct-96	19	77	Oct-96	11	17
Nov-96	82	215	Nov-96	139	348	Nov-96	6	51	Nov-96	9	89	Nov-96	9	20
Dec-96	106	281	Dec-96	198	474	Dec-96	18	68	Dec-96	32	106	Dec-96	16	26
Jan-97	82	232	Jan-97	147	417	Jan-97	12	47	Jan-97	25	82	Jan-97	11	21
Feb-97	77	216	Feb-97	126	367	Feb-97	12	41	Feb-97	21	72	Feb-97	11	29
Mar-97	80	253	Mar-97	133	456	Mar-97	11	57	Mar-97	19	87	Mar-97	9	29
Apr-97	79	230	Apr-97	156	391	Apr-97	9	51	Apr-97	14	74	Apr-97	16	20
May-97	55	231	May-97	92	344	May-97	10	51	May-97	19	75	May-97	15	17
Jun-97	59	202	Jun-97	94	348	Jun-97	5	45	Jun-97	9	73	Jun-97	8	23
Jul-97	57	176	Jul-97	91	326	Jul-97	10	47	Jul-97	14	88	Jul-97	7	15
Aug-97	51	196	Aug-97	98	316	Aug-97	8	56	Aug-97	21	81	Aug-97	6	20
Sep-97	58	168	Sep-97	84	279	Sep-97	8	30	Sep-97	11	42	Sep-97	6	15
Oct-97	55	194	Oct-97	84	294	Oct-97	7	38	Oct-97	13	55	Oct-97	8	14
Nov-97	98	251	Nov-97	152	401	Nov-97	16	60	Nov-97	21	92	Nov-97	17	19
Dec-97	91	215	Dec-97	175	371	Dec-97	18	39	Dec-97	36	74	Dec-97	14	34
Jan-98	71.5	206	Jan-98	127	355	Jan-98	10	43	Jan-98	16	74	Jan-98	5	28
Feb-98	64	239	Feb-98	120	400	Feb-98	8	44	Feb-98	10	65	Feb-98	8	14
Mar-98	91	224	Mar-98	151	392	Mar-98	10	51	Mar-98	21	97	Mar-98	9	26
Apr-98	67	220	Apr-98	104	366	Apr-98	11	60	Apr-98	17	106	Apr-98	4	23
May-98	64	201	May-98	115	308	May-98	6	52	May-98	6	80	May-98	11	13
Jun-98	57	192	Jun-98	91	302	Jun-98	10	43	Jun-98	16	64	Jun-98	5	18
Jul-98	64	175	Jul-98	111	291	Jul-98	10	29	Jul-98	18	46	Jul-98	9	17
Aug-98	70	177	Aug-98	107	298	Aug-98	10	40	Aug-98	12	67	Aug-98	12	10
Sep-98	66	192	Sep-98	112	308	Sep-98	12	58	Sep-98	23	86	Sep-98	5	18
Oct-98	71	191	Oct-98	110	314	Oct-98	12	52	Oct-98	23	89	Oct-98	12	32
Nov-98	80	179	Nov-98	144	293	Nov-98	15	46	Nov-98	37	75	Nov-98	12	17
Dec-98	62	244	Dec-98	112	437	Dec-98	8	59	Dec-98	21	95	Dec-98	9	24
Jan-99	107	245	Jan-99	200	425	Jan-99	12	49	Jan-99	18	94	Jan-99	14	33
Feb-99	63	194	Feb-99	101	335	Feb-99	15	42	Feb-99	26	69	Feb-99	10	25
Mar-99	74	199	Mar-99	111	332	Mar-99	16	57	Mar-99	27	94	Mar-99	10	14
Apr-99	67	229	Apr-99	116	386	Apr-99	10	46	Apr-99	13	75	Apr-99	18	28
May-99	59	206	May-99	106	339	May-99	9	67	May-99	32	97	May-99	10	11
Jun-99	56	183	Jun-99	104	300	Jun-99	6	47	Jun-99	10	79	Jun-99	14	12
Jul-99	59	202	Jul-99	107	304	Jul-99	9	53	Jul-99	20	74	Jul-99	11	17
Aug-99	65	193	Aug-99	119	340	Aug-99	7	44	Aug-99	14	66	Aug-99	16	32
Sep-99	59	162	Sep-99	101	253	Sep-99	8	47	Sep-99	12	61	Sep-99	6	17
Oct-99	74	187	Oct-99	135	328	Oct-99	16	47	Oct-99	32	66	Oct-99	7	24
Nov-99	68	200	Nov-99	111	350	Nov-99	9	58	Nov-99	24	102	Nov-99	5	20
Dec-99	82	218	Dec-99	140	337	Dec-99	13	67	Dec-99	17	104	Dec-99	6	18
Jan-00	74	215	Jan-00	132	376	Jan-00	13	49	Jan-00	37	82	Jan-00	4	12
Feb-00	67	204	Feb-00	91	335	Feb-00	5	44	Feb-00	6	66	Feb-00	8	20
Mar-00	67	211	Mar-00	112	342	Mar-00	7	42	Mar-00	13	65	Mar-00	10	28
Apr-00	65	225	Apr-00	126	370	Apr-00	6	53	Apr-00	11	72	Apr-00	19	22
May-00	61	179	May-00	100	264	May-00	6	47	May-00	10	79	May-00	16	17
Jun-00	57	179	Jun-00	89	289	Jun-00	15	36	Jun-00	28	55	Jun-00	7	20
Jul-00	58	194	Jul-00	90	301	Jul-00	9	46	Jul-00	19	64	Jul-00	9	17
Aug-00	58	156	Aug-00	94	262	Aug-00	12	32	Aug-00	20	58	Aug-00	11	13
Sep-00	51	151	Sep-00	92	241	Sep-00	11	25	Sep-00	26	32	Sep-00	4	24
Oct-00	57	173	Oct-00	97	289	Oct-00	11	39	Oct-00	25	67	Oct-00	6	14
Nov-00	52	191	Nov-00	88	317	Nov-00	12	45	Nov-00	26	68	Nov-00	16	14
Dec-00	74	241	Dec-00	137	405	Dec-00	11	59	Dec-00	24	102	Dec-00	13	26
Jan-01	68	221	Jan-01	132	380	Jan-01	5	45	Jan-01	11	79	Jan-01	7	24
Feb-01	67	179	Feb-01	131	314	Feb-01	5	34	Feb-01	7	59	Feb-01	17	19
Mar-01	59	217	Mar-01	99	342	Mar-01	8	59	Mar-01	16	87	Mar-01	10	15
Apr-01	63	215	Apr-01	110	346	Apr-01	8	44	Apr-01	14	72	Apr-01	15	15
May-01	55	267	May-01	97	431	May-01	8	56	May-01	13	98	May-01	11	27
Jun-01	65	205	Jun-01	92	336	Jun-01	11	47	Jun-01	20	75	Jun-01	2	19
Jul-01	60	232	Jul-01	91	364	Jul-01	2	48	Jul-01	2	70	Jul-01	9	16
Aug-01	56	200	Aug-01	97	293	Aug-01	8	61	Aug-01	12	86	Aug-01	7	9
Sep-01	46	199	Sep-01	72	298	Sep-01	5	56	Sep-01	10	87	Sep-01	6	14
Oct-01	73	232	Oct-01	117	365	Oct-01	9	52	Oct-01	14	89	Oct-01	6	22
Nov-01	82	245	Nov-01	139	385	Nov-01	13	50	Nov-01	25	79	Nov-01	2	19
Dec-01	80	293	Dec-01	146	474	Dec-01	17	63	Dec-01	38	108	Dec-01	22	23
Jan-02	81	246	Jan-02	122	403	Jan-02	10	50	Jan-02	15	74	Jan-02	5	20
Feb-02	59	271	Feb-02	86	430	Feb-02	8	52	Feb-02	12	76	Feb-02	4	26
Mar-02	96	309	Mar-02	173	503	Mar-02	13	67	Mar-02	22	116	Mar-02	8	22
Apr-02	75	222	Apr-02	121	366	Apr-02	7	44	Apr-02	12	81	Apr-02	5	13
May-02	70	247	May-02	109	357	May-02	11	51	May-02	15	75	May-02	9	16
Jun-02	60	236	Jun-02	102	375	Jun-02	13	63	Jun-02	21	96	Jun-02	7	20
Jul-02	83	229	Jul-02	135	360	Jul-02	11	45	Jul-02	19	79	Jul-02	5	19
Aug-02	70	197	Aug-02	109	304	Aug-02	5	42	Aug-02	10	68	Aug-02	7	13
Sep-02	60	210	Sep-02	84	328	Sep-02	6	38	Sep-02	10	57	Sep-02	7	6
Oct-02	63	209	Oct-02	83	338	Oct-02	4	32	Oct-02	5	54	Oct-02	5	15
Nov-02	81	225	Nov-02	117	357	Nov-02	8	36	Nov-02	14	51	Nov-02	5	21
Dec-02	93	274	Dec-02	162	422	Dec-02	5	63	Dec-02	8	95	Dec-02	7	23
Jan-03	85	266	Jan-03	146	436	Jan-03	8	44	Jan-03	10	62	Jan-03	9	14
Feb-03	79	251	Feb-03	128	372	Feb-03	4	51	Feb-03	5	67	Feb-03	7	21
Mar-03	82	247	Mar-03	128	351	Mar-03	7	40	Mar-03	10	54	Mar-03	15	16
Apr-03	73	283	Apr-03	124	431	Apr-03	4	59	Apr-03	10	78	Apr-03	4	30
May-03	81	265	May-03	138	390	May-03	6	56	May-03	19	78	May-03	9	13
Jun-03	79	251	Jun-03	134	381	Jun-03	6	57	Jun-03	13	86	Jun-03	8	16
Jul-03	88	264	Jul-03	133	399	Jul-03	7	51	Jul-03	13	72	Jul-03	6	20
Aug-03	64	219	Aug-03	89	353	Aug-03	1	38	Aug-03	2	61	Aug-03	5	27
Sep-03	72	206	Sep-03	123	344	Sep-03	8	44	Sep-03	25	63	Sep-03	11	15

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