TORONTO - Commuters using GO Transit next week are being advised to pack a snack.

GO says it plans to operate regular train and bus service during the G20 summit in Toronto, but says passengers should be prepared for delays.

GO says it anticipates that police activity and planned demonstrations will affect service intermittently and delays and detours could add time to the normal commute.

The transit operator says having a snack and a drink could be handy in the event of an extensive delay.

GO also says that on June 27, washrooms on some train cars will be out of service due to security requirements.