即使一个十字路口，也是二条路的交叉。所以为crossroads。复数不再加s, 单复数同形。

one crossroads, many crossroads.

     crossroads 单复数同形，永远用复数形式。除表示“十字路口”外，并引申作“活动中心”、“转折点”解。例如：a crossroads for returned overseas Chinese 归国华侨的活动中心 / a crossroads in history 历史转折点 / They are now at the crossroads. 他们现在正处于抉择的关头。（摘自《薄冰英语惯用法词典》） 

She says she has come to a crossroads in her life and must decide which way to go.

参考译文：她说她来到她人生的关键时刻，并必须决定走哪条路。

crossroads n.  十字路口; 转折点，重大的抉择时刻;

Turn right at the first crossroads.  

在第一个十字路口向右转。

The company was clearly at a crossroads. 

该公司显然处于发展的关键时刻。

They had reached a crossroads in their relationship.  

他们的关系发展到了关键阶段。

备注：现代英语，以复数形式出现表示单数含义。