The stakes have never been higher between both Manchester clubs ahead of today's (3 June) FA Cup final at Wembley Stadium.
United, of course, don't want City to replicate their 1999 treble-winning achievement of picking up the Premier League (PL), Champions League and FA Cup.
So far, it's one trophy down and two to go, as the blue side of Manchester has already proved to be the best team in England by winning this season's PL after seeing off Arsenal.
With Wembley's 90,000 stadium capacity, the aim is to keep rival fans as far away from each other as possible before the game.
It seems that travelling fans have been told to not use the same service stations as each other.
Back when United met City in the FA Cup semi-final in 2011, supporters clashed at motorway services en route to North London, and 34 arrests were made following violent scenes around the stadium.
Ahead of today's game, Transport for Greater Manchester (TfGM) has advised City fans to travel via the M62 and M1; M6 and M1; or M6, M6 Toll and M1.
While United fans are urged to travel on the M6, M42 and M40, which is a near-identical distance of about 200 miles (320 km).
When it comes to service stations, City fans are asked to use Lymm, Sandbach, Stafford, Norton Canes, Corley, Rugby, Watford Gap, Northampton, Newport Pagnell, Toddington and London Gateway.
The services suggested for United supporters are Knutsford, Keele, Hilton Park, Warwick, Cherwell Valley, Oxford and Beaconsfield.
It's important to note that these are just suggestions and there are no plans for the guidance to be officially enforced.
AA public relations manager Tony Rich said: "The best mode of travel for football fans will be the official coaches and the extra coaches put on by the FA.
"For those who plan to drive themselves to Wembley they are advised to set off early, using alternative routes where possible as most major roads are likely to be busy with coaches carrying supporters to the game."
Tom Legg, head of external operations at the FA, said: "With limited services across the weekend, we would encourage supporters coming to the game to book their coach space early and use the options that The FA has put in place to support them."
Of the treble, City manager Guardiola said: “I could understand that. It belongs to them, that’s normal. Sport is like that.
“’That belongs to us – we don’t want anyone else to do it,’ it’s normal, that feeling. It’s completely understandable. But it’s a football game, who will be better will win.”
Kick-off is at 3.00pm and fans can tune in to watch the game for free on BBC One from 1:50pm and ITV1 from 2:05pm.Featured Image Credit: Sipa US / @imagesBV / Alamy Stock Photo