When you re-engineer a road layout, you have to assess its impact on the control system. The existing system may be adequate, it may require an update, or it may have to be completely revamped.
Generally speaking, revamped implies a major change but not a complete replacement, e.g. lifting a house from its original footings, adding a room on the side, ripping out the interior for a new room layout, adding windows and skylights, changing the exterior trim, but staying on the same basic foundation.
When you use revamped in this context, you are telling the reader indirectly that a large change will be needed. If your control system was just a few painted signs, revamped would make sense. If the control system was a component in a city-wide traffic management system, revamped might be going too far.
However, the audience also matters. For the budget-minded supervisor, a minor reconfiguration of existing control assets sounds responsible and professional. For the mayor’s speech, completely revamped might not be going far enough.