| Value | Category |
|---|---|
| -99 | Refused to answer |
| -88 | Not provided |
| -77 | Not applicable |
| -66 | Do not know |
| 1 | Lack of load / oversupply of vehicles |
| 2 | Prices below breakeven point |
| 3 | Decisions made by institutions in charge of freight allocati |
| 4 | Frequent vehicle breakdown |
| 5 | Other |