Taken from owners manual
Yellow triangle with . CAUTION
When the speed limit information function or intelligent speed assist function is enabled, and the front view camera detects a speed limit sign with text message below, the warning lamp illuminates yellow to remind the driver to recognise the text message by themselves. The camera cannot recognise the text messages provided below the speed limit sign, such as auxiliary lane, 100mls ahead, school section, 7:00-10:00. The camera will recognise the speed limit sign with text messages as a normal speed limit sign. The driver is required to make correct judgement according to the text message.