Why did the girls always take a different route to school in number of the stars?

In "Number the Stars" by Lois Lowry, the girls, particularly Annemarie and her friend Ellen, take a different route to school to avoid the German soldiers who occupy Denmark during World War II. This detour helps them stay safe and reduces the risk of being confronted or questioned by the soldiers. The change in route symbolizes their awareness of the dangers around them and their desire to protect themselves and each other amidst the oppressive circumstances.