Traffic volume
Traffic is regularly counted and reported by Hrvatske autoceste, operator of the motorway, and results are published by Hrvatske ceste. The largest annual average daily traffic (AADT) volume is often recorded in the Sveta Helena–Komin section, although all sections between Sveta Helena and Varaždin display similar AADT. AADT data for sections north of Varaždin show considerable drops in traffic volume. As the motorway traffic volume is measured through analysis of toll ticket sales, the southernmost section of the motorway, Ivanja Reka–Sveta Helena, is not included in the report. However, since the section is a part of the Zagreb bypass, it carries significantly heavier traffic than any other sections of the A4 motorway—in 2004, traffic volume along the toll-free section of the A4 motorway was approximately 24,000 vehicles per day (AADT) between the Kraljevečki Novaki and Sveta Helena interchanges and nearly 41,000 vehicles per day between the Kraljevečki Novaki and Ivanja Reka interchanges. Traffic volume measured on the Ivanja Reka–Ivanić Grad section of the A3 motorway increased by 30%, hinting at a similar increase in traffic volume on the A4 route south of Sveta Helena.