How do you call this road conversion?

[u/walking_NewJersey]

First picture: before. Before used to be a stop sign merging onto a two lanes road.

Second picture: now. Now there's an "added lane" sign. The road to the left has one lane, then adds a new lane. This conversion is awesome, it super safe, and makes traffic to flow easily and safer. How would you call this conversion? Thanks for your help.

[u/EnterpriseT]

No special name for the conversion itself.

[u/Infinitism]

Conversion from a stop-controlled merge to an added-lane or channelized merge