I'm not sure merging onto motorways etc is a driving test requirement, but it should be.
If you drive the opposite way on the A46 towards Syston, the slip road from Wanlip is incredibly short resulting in sudden, slow merging traffic, causing difficulties for faster moving traffic on the main carriageway where the lanes already start to merge over into the A46 N/Bound, and away for Syston/Thurmaston. That is a bad junction.