This is the 11725th most frequent French word.
signalées
"Reported" or "indicated."
Here, 'signalées' is used as a past participle to indicate that the errors were identified or highlighted by the teacher.
Les erreurs signalées par le professeur doivent être corrigées.
The mistakes pointed out by the teacher must be corrected.
In this sentence, 'signalées' conveys the idea that these roads were indicated or labeled as risky or unsafe.
Les routes signalées comme dangereuses sont évitées.
The roads marked as dangerous are avoided.
Using 'signalées' here implies that the anomalies were mentioned or brought attention to within the report for further action.