Are you traveling to Utrecht by car? Park your car clever and cheap at a P&R location, like the P+R Transferium Westraven near the exit Jaarbeurs next to the A12. From here you easily take the bus or the tram to the city centre. With a combi-ticket for one of the Utrecht P+R locations you only pay € 6,00 for a whole day of parking and that includes the fee for your transfer to the city centre. On the map below you'll find the three P+R transferiums, so you can navigate to them real quick.
Would you rather park in the city centre of Utrecht? From the Ring Utrecht follow the signs to centrum into the city centre. You will then automatically enter the city via the main roads. It is wise to follow the main roads as long as possible. This is faster than driving through neighborhoods and residential areas. The parking places are indicated near by the center.