Can I describe as "revamp the control system" for making some change at a system?
Solution 1:
I've been making corrections to badly translated English for a Italian construction firm. They've been using the word "revamped" to mean upgrades and modifications to old machinery. Personally I don't like it. I think "revamping" in regular use has an aesthetic connotation more closely related to fashion and design (the word origin is from shoe repair). I think you can revamp a clothing collection, or a store layout but for more technical applications I'd agree with the commentator above and use terms like "reconfigure" for minor changes and "overhaul" for major ones.
Solution 2:
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.