Istrian Y full-profile upgrade (A8 and A9)

Second carriageway added to the two-lane road. Wikipedia: the upgrade of the route started in 2008 and the expansion of the first section, Kanfanar–Rogovići, was completed in October 2011. This section is still tolled separately. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith). Length measured from OpenStreetMap geometry.

Second carriageway, 12 km, opened to traffic in November 2020. Wikipedia gives the whole 28 km Rogovići – Učka Tunnel full-profile works as HRK 1.2 billion excluding VAT (kuna, not converted); started 15 November 2018 and built in three sub-phases. The drawn length is 10.4 km, 13% below the sourced figure. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

Cerovlje–Lupoglav and Lupoglav–Vranja, 13 km as stated by Wikipedia, opened to traffic in July 2021. Wikipedia gives the whole 28 km Rogovići – Učka Tunnel full-profile works as HRK 1.2 billion excluding VAT (kuna, not converted); started 15 November 2018 and built in three sub-phases. The road mapped in OpenStreetMap between Cerovlje and Vranja measures 16.8 km, 29% above the sourced figure, and the whole Rogovići–Vranja stretch about 27 km, close to the 28 km total for Rogovići – Učka Tunnel; the 13 km figure was left as sourced. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

Second tube, 5,634 m. Excavation started on 17 December 2020, breakthrough was completed on 18 September 2023, and the tube opened to traffic on 13 September 2024, slightly later than planned. Wikipedia notes that the 2011 plan was a 2015 completion. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

10.5 km from the Kvarner portal of the Učka Tunnel to the Matulji interchange, including the interchange; the 2023 amendment gives the second-lane stretch as almost 10.3 km. Wikipedia dates the start of the additional lanes to September 2023; the official start-of-works ceremony was held on 16 February 2024. On 17 July 2026 the minister said the first four kilometres would open within about ten days and the whole section in the first quarter of 2027; no opening is confirmed here. Value of the three projects together (Učka–Matulji full profile, Mirna bridge, Limska Draga viaduct) is about EUR 214 million per the concessionaire and press; the cited sources give no per-lot figure. Contract Amendment No. 7 of 10 May 2023 covered the same works at about EUR 200 million, with a 38-month duration from July 2023. The Matulji interchange rebuild is a EUR 17.7 million project per the minister. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

Wikipedia: upgrade to four lanes started on 6 October 2008; the Pula–Kanfanar section, approximately 30 km, was completed on 20 June 2010, and the ticket toll system was introduced on it. The mapped road measures 27.2 km. Source: total cost of the A9 upgrade was EUR 228 million (Wikipedia), for all the 2A-stage works, not for this section alone. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

Wikipedia: the 50 km section between the Kanfanar interchange and Umag was upgraded to four lanes by 14 June 2011, eight months ahead of schedule. The Mirna Bridge and the Limska Draga viaduct kept a single carriageway each; their second structures are separate lots. No start date is recorded: the 2008 start in the source refers to the whole upgrade. The mapped road measures 47.7 km. Source: total cost of the A9 upgrade was EUR 228 million (Wikipedia), for all the 2A-stage works, not for this section alone. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

Parallel structure beside the existing 1,354 m Mirna Bridge, completing four lanes. Construction started in February 2024. The 2023 contract amendment targeted completion in 2026; the press expected it by the end of 2026. Wikipedia's list of works gives 2.5 km for this item, which probably includes approaches; the bridge length is used. Value of the three projects together (Učka–Matulji full profile, Mirna bridge, Limska Draga viaduct) is about EUR 214 million per the concessionaire and press; the cited sources give no per-lot figure. Contract Amendment No. 7 of 10 May 2023 covered the same works at about EUR 200 million, with a 38-month duration from July 2023. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).

Parallel 552 m viaduct, largest span 160 m. One lane was opened to traffic on 26 September 2026 under temporary regulation, with full opening expected within about ten days; that has not been confirmed, so the lot stays under construction. Value of the three projects together (Učka–Matulji full profile, Mirna bridge, Limska Draga viaduct) is about EUR 214 million per the concessionaire and press; the cited sources give no per-lot figure. Contract Amendment No. 7 of 10 May 2023 covered the same works at about EUR 200 million, with a 38-month duration from July 2023. Upgrade of an existing road: the original road stays in the network as its own lot, so this lot is excluded from network totals (sharedWith).