The superconducting critical current of corner-shaped Al superconducting microstrips has been investigated. We demonstrate that the sharp turns lead to asymmetric vortex dynamics, allowing for easier penetration from the inner concave angle than from the outer convex angle. This effect is evidenced by a rectification of the voltage signal otherwise absent in straight superconducting
strips. At low magnetic fields, an enhancement of the critical current with increasing magnetic field
is observed for a particular combination of field and current polarity, confirming a theoretically
predicted competing interplay of superconducting screening currents and applied currents at the
inner side of the turn.