Glance ahead is an action to quickly or briefly look at what is coming up next. There are several synonyms for the phrase "glance ahead" that mean the same thing. One synonym is "glimpse forward," which conveys the idea of a brief or fleeting look into the future. Another synonym is "peek ahead," which suggests a quick, cautious look ahead. "Preview ahead" is a more intentional synonym that suggests an intentional and thorough look ahead. Finally, "survey ahead" conveys the idea of taking an overview or broad look ahead. Regardless of the synonym used, all convey the idea of preparing for what is to come.