| Overview | ||||||||||||||||
| Before ESL | After ESL | Difference | ||||||||||||||
| Average | % average over SL | 85th | SL | Average | % average over SL | %ile speed | % drivers over SL | 85th | SL | Average | 85th | |||||
| I-635, Dallas County, Belt Line | 68.9 | 6.1% | 74 | 65 | 66.8 | 11.3% | 5.5% | 94.5% | 72 | 60 | -2.2 | -2.0 | ||||
| US 75, Collin County, FM 543 | 69.0 | -1.4% | 74 | 70 | 66.6 | 2.5% | 38.2% | 61.8% | 71 | 65 | -2.4 | -3.0 | ||||
| US 380, Collin County, Collins | 67.5 | -3.6% | 72 | 70 | 63.9 | -1.7% | 64.5% | 35.5% | 67 | 65 | -3.6 | -5.0 | ||||
| US 380, Denton County, US 377 | 64.6 | 70 | 70 | 65 | (incomplete data available) | |||||||||||
| I-635, Dallas County, Scyene | 69.1 | 6.3% | 75 | 65 | 65.9 | 9.8% | 12.1% | 87.9% | 71 | 60 | -3.2 | -4.0 | ||||
| I-30, Rockwall County, FM 551 | 68.3 | -2.5% | 73 | 70 | 67.1 | 3.3% | 31.7% | 68.3% | 71 | 65 | -1.1 | -2.0 | ||||
| I-20, Dallas Cty, St. Augustine | 72.6 | 75+ | 70 | 65.6 | 69 | 65 | (removed because value highly irregular) | |||||||||
| I-35, Dallas County, Keaton Rd. | 68.4 | -2.2% | 72 | 70 | 68.5 | 5.4% | 23.1% | 76.9% | 73 | 65 | 0.1 | 1.0 | ||||
| I-35, Denton County, FM 407 | 70.4 | 0.6% | 74 | 70 | 68.5 | 5.4% | 27.2% | 72.8% | 73 | 65 | -1.9 | -1.0 | ||||
| US 67, Ellis County, N. of 287 | 66.7 | -4.6% | 71 | 70 | 64.9 | -0.1% | 55.5% | 44.5% | 70 | 65 | -1.8 | -1.0 | ||||
| US 287, Ellis County, FM 664 | 67.9 | -3.0% | 72 | 70 | 66.0 | 1.6% | 45.3% | 54.7% | 70 | 65 | -1.9 | -2.0 | ||||
| I-45, Ellis County, US 287 bus. | 70.6 | 0.9% | 75+ | 70 | 70.0 | 7.6% | 17.2% | 82.8% | 75 | 65 | -0.6 | 0.0 | ||||
| US 80, Kaufman County, Spur 557 | 69.6 | -0.5% | 74 | 70 | 69.7 | 7.3% | 14.9% | 85.1% | 74 | 65 | 0.1 | 0.0 | ||||
| US 175, Kaufman County, FM 148 | 69.0 | -1.4% | 74 | 70 | 68.3 | 5.1% | 21.9% | 78.1% | 73 | 65 | -0.7 | -1.0 | ||||
| I-20, Kaufman County, FM 740 | 70.0 | 0.0% | 75+ | 70 | 68.7 | 5.7% | 28.1% | 71.9% | 75 | 65 | -1.2 | 0.0 | ||||
| Averages | 68.8 | -0.4% | 67.2 | 4.9% | 29.6% | 70.4% | -1.6 | -1.5 | ||||||||
| Explanation: | Average: average speed | |||||||||||||||
| % average over SL: % average speed is higher than speed limit | ||||||||||||||||
| % drivers over SL: % of drivers exceeding the speed limit | ||||||||||||||||
| %ile speed: percentile speed that speed limit represents | ||||||||||||||||
| 85th: 85th percentile speed, a key figure for determining the appropriate speed limit. | ||||||||||||||||
| SL: posted speed limit | ||||||||||||||||
| Difference: difference of indicated figure before and after ESLs | ||||||||||||||||
Notes:
1. The 85th percentile speeds for I-45, Ellis County, US 287 bus. and I-20, Kaufman County, FM 740 are actually "75+". The radar tally sheets had one checkbox for any speeds 75 or higher. The 75+ notation was converted to 75 to enable rudimentary mathematical modeling. 2. The posted limit is on average 8 MPH below the 85th percentile speed limit, resulting in, on average, 30th percentile speed limits (criminalizing 70% of all drivers). |
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