Not sure where you are, but here in Ohio the discretion would be left almost entirely up to the engineer for the town, requiring only internal review and no public comment.
I don't know the context, but this sounds like something that should be fought. Medians definitely can be a community feature and a traffic calming measure, even beautification with brick or landscaping. Rarely are medians like this removed for anything other than road widening or 'increased access'. Just know that fighting an engineer resolved to follow through on a project like this can be especially difficult, as the number one fall-back is safety concerns. Traffic safety is often the specter hanging over road widening projects, even though the benefits of widening are shaky at best. If the concern truly is just maintenance, then this plan necessitates a conversation about the value of the median to the neighborhood character and whether or not that balances with the maintenance cost. It's likely the value added is much greater, and you could advocate for that stance.