As he gives you thorough directions, he might say something like this: “Be careful about that next turn. The sign is misleading.
وَفِيمَا يُعْطِيكَ إِرْشَادَاتٍ مُفَصَّلَةً ،‏ قَدْ يَقُولُ :‏ « اِنْتَبِهْ عِنْدَ ٱلْمُنْعَطَفِ ٱلتَّالِي .‏