As part of the Town Centre Improvements the Local Transport Plan for Ipswich, it was approved when considering the bus gyratory that the whole of the town centre should be restricted to 20-MPH speed limit. The town centre being defined as that area bounded by the following streets, Crown Street, St Margaret's Street, Bond Street, Waterworks Street, Star Lane, Greyfriars Road, Franciscan Way and Civic Drive.
This area covers the main shopping streets where the greatest number of pedestrians is present and traffic speeds are generally low. The speed limit will help to reinforce the need for drivers to be aware of pedestrians.
There are very few places where speeds in excess of 20 mph can be maintained within this area and the number of pedestrians is high particularly during the day. The introduction of a 20 mph speed limit over the whole area of the town centre streets would enable signs on the entry points to indicate that this is a special 20 mph zone and would emphasise the need for drivers to reduce speed.
| Arcade Street | Black Horse Lane | Buttermarket | Carr Street |
| Cornhill | Cox Lane | Coytes Gardens | Cromwell Square |
| Curriers Lane | Cutler Street | Dial Lane | Dog's Head Street |
| Eagle Street | Elm Street | Falcon Street | Fore Street - Eagle Street to Star Lane |
| Foundation Street | Friars Street | Great Colman Street | High Street - Westgate St to Crown St |
| King Street | Lion Street | Lloyds Avenue | Lower Brook Street |
| Lower Orwell Street | Museum Street | Northgate Street | Old Foundry Road |
| Orwell Place | Peel Street | Pleasant Row | Princess Street - Cornhill to Civic Drive |
| Providence Street | Queen Street | Rose Lane | Shire Hall Yard |
| Silent Street | Smart Street | St Lawrence Street | St Matthews Street Service Road |
| St Peter's Street | St Stephen's Lane | St. Nicholas Street | Tacket Street |
| Tavern Street | Tower Ramparts | Tower Street | Turret Lane |
| Union Street | Upper Barclay Street | Upper Brook Street | Upper Orwell Street |
| Westgate Street | Westgate Street Service Road | Wingfield Street |