How to add a mesh to a spline without deforming it?

[anonymous_user_cc846a031 (anonymous_user_cc846a03)]

Hey fellow humans,
i worked through this tutorial: Using Splines & Spline Components | Live Training | Unreal Engine - YouTube
Id like to know how i could add some meshes to it without getting deformed. The guard rails work pretty similar to it but they deform when the spline gets deformed.

[anonymous_user_cc846a031 (anonymous_user_cc846a03)]

For example when want to add some trafficlights i dont want them to bend around