(a) Model 1 | ||||
Treatments | All crash type | Lane-departure crashes | ||
All | Fatal and injury | All | Fatal and injury | |
Safety edge | 0.784 | 0.770 | 0.858 | 0.758 |
1 ft lane widening | 1.098 | 1.333 | 1.242 | 1.351 |
2 ft lane widening | 1.205 | 1.778 | 1.542 | 1.825 |
(b) Model 2 | ||||
Treatments | All crash type | Lane-departure crashes | ||
All | Fatal and Injury | All | Fatal and Injury | |
Asphalt resurfacing | 0.399 | 0.388 | 1.267 | 1.360 |
Adding 2 ft paved shoulders with shoulder rumble strips | 0.745 | 0.516 | 0.766 | 0.536 |
Adding 2 ft paved shoulders | 1.292 | 1.107 | 0.727 | 0.731 |