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Hidden Camera Trial - Data

Download data as an Excel spreadsheet: LTSA Hidden Speed Camera Trial Data.

 

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