| T | Degrees of freedom | Significant level | Mean Difference | Confidence interval 95% | |
Upper limit | Lower limit | |||||
Declaration of path geometry conditions (such as screws and slopes) | 1.070 | 119 | 0.287 | 0.13333 | −0.1135 | 0.3801 |
Diagnosis and prediction of air pollution | 8.462 | 119 | 0.000 | 0.78333 | 0.6000 | 0.9666 |
Forecasting weather conditions | 7.702 | 119 | 0.000 | 0.73333 | 0.5448 | 0.9219 |
Warning about exceeding the safe speed | 9.132 | 119 | 0.000 | 0.68333 | 0.5352 | 0.8315 |
Providing safe speed selection information along the way | 7.029 | 119 | 0.000 | 0.72500 | 0.5208 | 0.9292 |
Coordination with agencies responsible for emergency relief | 9.867 | 119 | 0.000 | 0.75000 | 0.5995 | 0.9005 |
Controlling and monitoring suspicious vehicles | 7.029 | 119 | 0.000 | 0.74167 | 0.5327 | 0.9506 |
Declaration of route blocking information due to maintenance or reconstruction | 1.969 | 119 | 0.051 | 0.20833 | −0.0011 | 0.4178 |
Alternative route Guide | 3.455 | 119 | 0.001 | 0.35833 | 0.1530 | 0.5637 |
Inputs and outputs control of the route | 14.989 | 119 | 0.000 | 1.03333 | 0.8968 | 1.1698 |
Law enforcement through collecting violation evidence | 8.669 | 119 | 0.000 | 0.82500 | 0.6366 | 1.0134 |
Announcing route traffic and suggesting public transportation alternatives | 13.382 | 119 | 0.000 | 0.93333 | 0.7952 | 1.0714 |
Announcing the exact departure time of public transportation alternatives | 13.882 | 119 | 0.000 | 0.85833 | 0.7359 | 0.9808 |