| Reference | TCCS 31:2020/TCĐBVN |
|---|---|
| Document type | Standard |
| Issuing authority | Directorate for Roads of Vietnam |
| Date of issue | 6 November 2020 |
| Signed by | Nguyễn Văn Huyện |
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Đường ô tô – Tiêu chuẩn khảo sát
TCCS 31:2020/TCĐBVN