|Local Names:||Nestem Freeway,
Ehrmantraut Highway, Dexonharzleman Expressway (Adustelan only)
|South Terminus:||CIR 8 near Nestem|
| in Adustelan
|North Terminus:||Holtz Road in Vernindelan|
Intercounty C4 (I-C4) is an Intercounty Limited Access Highway located on the Eastern coast of Carraway Island. It runs from Carraway Island Route 8 west of the Town of Nestem up to Holtz Road in the Town of Vernindelan. It is, by daily traffic, the busiest freeway on Carraway Island, primarily due to being the main arterial highway of the City of Adustelan, the island's capital and largest city.
I-C4 lies entirely in two counties: Rilloq and Bisloeca. In Bisloeca, it is known as the Nestem Freeway, despite not passing through the Town of Nestem. In Rilloq, it is known as the Ehrmantraut Highway, except in the City of Adustelan when it is referred to as the Dexonharzleman Expressway (colloquially "The Dex"), named for former mayor Alois Dexonharzleman.
Exit list (incomplete)
|Rilloq||Adustelan||East Kempton||26||Kempton/East Kempton||Northbound exit: New Villa Avenue|
|Southbound exit: Amarillo Street|
|28||Ventana Avenue/Joel-Cranston Crosscourts Arena|
|City Center||29||Soundsurf Avenue||To Rarity Street|
|Quinton||30||Fischbach Avenue / Eastern Road||Quarry Pit Interchange|
|Jennaviva||32||Jennaviva Convention Center||Northbound Exit: St. Lucia Avenue South and Colgate Street|
|Southbound Exit: Jennaviva Boulevard|
|South Adustelan||Crosses Jennaviva River|