Zagreb bypass (obilaznica, zaobilaznica), formally known as the urban highway (Gradska autocesta) is an U-shaped freeway partially encircling of Zagreb, Croatia. The largest part by far, from Jankomir to Ivanja Reka, was built from 1977 to 1979, while the part between Ivanja Reka and Sveta Helena was built from 1996 to 1999. The bypass is long and spans around the city from the northwestern suburb Zaprešić to Sveta Helena in the northeast. Reaching more than 80,000 daily trips, it is the most heavily used highway in Croatia.

In its current form, the Zagreb bypass has a small number of widely spaced interchanges. A proposal has been made in 2007 for a new interchange near Zaprešić. The current one prolongs the trip from Zaprešić to Zagreb via the bypass by .

The Zagreb bypass is concurrent with numerous routes including highways A2, A3 and A4, state routes D1, D3 and D4 and European routes E59, E65, E70 and E71.

The highway is currently four lanes wide throughout its entire length. It will be widened to six lanes between the Jankomir and Ivanja Reka interchanges due to the high traffic amounts. Experts presume that widening(s) of the highway will be good for the next 10 years. Afterwards, a new beltway will be built around Zagreb.

Due to the Medvednica mountain, Zagreb bypass is U-shaped, leaving the city without a northern bypass that would connect the A2 and A4 highways. A northern branch of the bypass (Sjeverna tangenta) is supposed to bridge the gap. It is supposed to connect the Zaprešić interchange with the Popovec interchange.

List of interchanges and exits

Number	Km	Name	County	Highways	Notes
6	0.0	Zaprešić	Zagreb County	A2, D225 (Bologna Alley)	Cloverleaf interchange
3, 7	6.4	Jankomir	City of Zagreb	A2, A3, Ljubljanska Avenue, Ježdovečka Street	A modified cloverleaf with ramps leading to Ježdovečka Street, a two-lane road to Lučko Airport. These ramps are only accessible from north and east.
1, 4	11.5	Lučko	City of Zagreb	A3, A1, A6, Jadranska Avenue, Puškarićeva Street	A stack interchange with two loop ramps and two flyovers. It incorporates a smaller interchange with the old D1 road in direction of Lučko on Adriatic Avenue accessible from all directions.
		Sveta Klara	City of Zagreb	A3, Većeslav Holjevac Avenue	Trumpet, in planning stages. Upon completion, it will supersede the Buzin exit. It is planned to be built in 2008.
5	19.1	Buzin	City of Zagreb	A3, D30 (Velikogorička Road), Germany Avenue	Currently an AB parclo. Due to congestion, its purpose as being an important link between Velika Gorica and Zagreb will be replaced by the new A11 highway and Jakuševec interchange. The current layout of Buzin interchange won't be in use anymore by 2008.
		Jakuševec	City of Zagreb	A3, A11, Sarajevska Road	A cloverleaf. This interchange was a problematic one to build due to a connector highway from Sarajevska Road to the interchange itself. The connector highway had to pass either over or under a railway station near the interchange. The route under the station was chosen requiring a steep 6% grade on the connector highway.
	29.6	Kosnica	Zagreb County	A3, D31, D43 (Radnička Road)	A cloverleaf. Leads to the recently finished Homeland bridge.
6, 12	32.6	Ivanja Reka	City of Zagreb	A3, A4, Slavonska Avenue	A modified cloverlaf, a mirror image of Jankomir interchange, but without on and off-ramps to secondary roads. A mainline toll plaza is located on A3 highway east of the interchange.
11	35.4	Kraljevački Novaki	City of Zagreb	A4, Sesvetska Road, Selska Road	A B2 parclo (folded diamond).
10	38.5	Popovec	City of Zagreb	A4, Soblinečka Road	A trumpet interchange.
9	49.8	Sveta Helena	Zagreb County	A4, B28	A cloverleaf interchange.

References

External links

• Official site of Zagreb
• Croatian highway authorities
• Croatian road authorities