| Reasons | Within the past seven days | Within the past thirty days | Within the past two months | Within the past six months | Within the past year | Total |
| Convenience | 0.13 (0.33) | 0.15 (0.36) | 0.07 (0.25) | 0.14 (0.35) | 0.07 (0.26) | 0.56 (0.5) |
| Safety/to avoid driving under the influence | 0.07 (0.26) | 0.09 (0.29) | 0.03 (0.17) | 0.06 (0.23) | 0.05 (0.22) | 0.30 (0.46) |
| Car is not available | 0.07 (0.26) | 0.06 (0.24) | 0.05 (0.22) | 0.06 (0.24) | 0.02 (0.15) | 0.27 (0.44) |
| Destination has little or no parking availability | 0.06 (0.23) | 0.08 (0.27) | 0.02 (0.14) | 0.06 (0.23) | 0.03 (0.18) | 0.24 (0.43) |
| Cheaper than other alternatives | 0.05 (0.22) | 0.05 (0.22) | 0.01 (0.12) | 0.07 (0.25) | 0.02 (0.15) | 0.21 (0.41) |
| Parking at destination is expensive | 0.06 (0.24) | 0.05 (0.21) | 0.01 (0.12) | 0.05 (0.21) | 0.01 (0.12) | 0.19 (0.39) |
| Transit is not accessible | 0.02 (0.14) | 0.01 (0.12) | 0.01 (0.10) | 0.01 (0.10) | 0.00 (0.07) | 0.06 (0.23) |
| Transit is not reliable | 0.02 (0.14) | 0.01 (0.10) | 0.00 (0.00) | 0.00 (0.00) | 0.00 (0.00) | 0.03 (0.17) |
| Other reason | 0.01 (0.10) | 0.01 (0.10) | 0.00 (0.07) | 0.00 (0.07) | 0.00 (0.07) | 0.03 (0.18) |
| Other modes are not available | 0.00 (0.00) | 0.01 (0.10) | 0.00 (0.07) | 0.00 (0.07) | 0.00 (0.07) | 0.02 (0.15) |