The antonyms for the phrase "continues ahead" can vary depending on the context in which it is used. In general, some of the antonyms that could be used may include "stops," "pauses," "turns back" or "returns." Other antonyms might include "halts," "discontinues," "abandons" or "diverts." These words all suggest a deviation or break from the typical activity of moving forward. Alternatively, synonyms for "continues ahead" might include "progresses," "moves on," or "advances." The right word will depend on what is happening within the particular situation or context.