The Urban Development of Laajasalo and the Boulevardisation of Laajasalontie

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1 The Urban Development of Laajasalo and the Boulevardisation of Laajasalontie Pirjo Siren Project Director City of Helsinki, City Executive Office, Urban Development

2 and Kruunuvuorenranta Laajasalo is an island 3 kilometres east of the Helsinki Market Square and Helsinki City Centre The upcoming Kruunuvuorenranta area project is located on the western shore of Laajasalo, the centre of Laajasalo will also be developed The position of Laajasalo changes completely in 2026, the Crown Bridges light rail project connects the island to the centre of Helsinki Travel time to centre minutes, the most used tramline 4 bridges, 10 km light rail service The island currently has 16,000 inhabitants Kruunuvuorenranta new inhabitants and 650,000 sq.m. floor area of housing Kruunuvuorenranta is one of the largest seashore projects in Helsinki and in Finland Private investments 4 billion euros, City investments about 700 million euros A modest city boulevard envisioned in the centre of Laajasalo (part of the Crown Bridges route), land use and services are developed heavily at the core of the city reformation. Centre of Laajasalo to have at least 6,000 new inhabitants 9 February 2018 Pirjo Siren

3 Laajasalontie Market Square City Centre Kruunuvuoren ranta

4 Ilomäentie Laajasalo Laajasalontie Reposalmentie Laajasalo Laajasalontie Reposalmenti e Koirasaarentie The housing will be increased by around 300,000 sq.m. floor area, about 6,000 new residents. Housing to Koirasaarentie, Laajasalontie, Yliskylänlahti, Ilomäentie and Reposalmentie.

5 Koirasaarentie Circle from Koirasaarentie via the centre of Laajasalo to Reposalmentie Housing to Koirasaarentie 49,000 sq.m. floor area, detailed plan committee autumn 2018

6 Laajasalo Laajasalontie Circle from Koirasaarentie via the centre of Laajasalo to Reposalmentie. Additional 32,000 sq.m. floor area to the centre, 119,000 sq.m. to Yliskylänlahti. Laajasalontie boulevard street cross section with light rail planning requirements. Street cross section is about 47 m, reservations for 2 lanes in both directions, 4 tree lanes, light rail reservation in the middle of the street and pedestrian and bicycle lanes. In the western part, the bicycle lane is a bicycle quality corridor (In Helsinki called baanas).

7 Circle from Koirasaarentie via the centre of Laajasalo to Reposalmentie. On Laajasalontie, in the centre of Laajasalo, construction of shopping centre in contract work (NCC Property Development). New library, house for youngters, etc.

8 Optiplan Oy Circle from Koirasaarentie via the centre of Laajasalo to Reposalmentie llomäentie area, housing sq.m. floor area, detailed plan proposition in Helsinki City committee autumn 2018.

9 Studies made during the preparation of the change of the detailed plan Traffic arrangements on Laajasalontie change considerably. Studies on functionality, safety and health, as well as feasibility have been made as part of the planning. Laajasalontie is not principally a motorway like Lahdenväylä, Turunväylä or Hämeenlinnanväylä. Based on this detailed plan change, the feasibility has been studied The work has included traffic estimates made by the urban environment division's traffic planning office. They have been done as a scenario with bias on motor car traffic (motor traffic utilisation rate is current Helsinki average and public transport utilisation rate below target-driven estimates) The traffic planning has complemented the EMME models so that the full complementary construction potential of Laajasalo has been constructed and Vartiosaari has been constructed (new housing construction added) Functionality analyses have been made of the changing traffic arrangements on Laajasalontie and Herttoniemi street network. They have been done in the so-called most challenging traffic situation (morning rush hour in 2035, when the full construction potential of Laajasalo has been constructed and Vartiosaari has been constructed), in a situation where transport habits do not change a lot in comparison to the transport habits of the latest source data (HSL 2012). According to the functionality analyses, there were no major problems in the Laajasalontie analysis area. The situation and the necessary measures to ensure the traffic functionality in Herttoniemi are not yet clear. City of Helsinki

10 Of all the starting points, the functionality analysis and the detailed plan studies have been based on the traffic situation that produces the most motor traffic. The traffic estimates have been made with different presumptions using the common EMME program. The hypotheses have been, e.g., a car-oriented traffic model and a model, in which the pricing has been set in accordance with HSL's Helmet model (smallest motor traffic production). Now about vehicles In 2035 about vehicles -> traffic light crossings possible Other source data used for the traffic functionality analyses are area-specific manual censuses based on population prognoses, which in turn are based on research data (HSL 2012) of the current traffic behaviour. Traffic censuses of the actual current situation have also been utilised. City of Helsinki The utilisation rate of the crossing capacity during morning rush hours, according to the traffic plan draft

11 Canyon-like street sections in Laajasalontie, the heights of planned buildings vary a lot. These features increase the air change and improve the dilution conditions of the emissions.. Noise and air quality studies based on traffic estimate Air quality study included measuring of nitrogen dioxide (NO2) and fine particles (PM2,5) levels The modelling for the spreading of emissions was done using two modelling systems the CAR-FMI open road line model and the OSPM street canyon model Source data In the modelling, there were canyon-like street sections, classified as wide street canyons (height/width ratio < 0,7) the heights of planned buildings vary a lot. These features increase the air change and improve the dilution conditions of the emissions. Road traffic emissions were measured with vehicle typespecific and speed dependent emission coefficients of the Euro 4 emissions standard. The most unfavourable estimate situation was considered by using the traffic volume estimate of the 2040 car-biased scenario on Laajasalontie (30,900 vehicles/day) and on Reposalmentie (9,500 vehicles/day) and the current background concentration levels.

12 Detailed land use plan solution approvable. Conclusions, NO2 - Most often, the concentrations of impurities were smaller than the highest concentrations in the modelling calculations. In the objects studied through the street canyon model, the concentrations of nitrogen dioxide were under the yearly limit on all height levels. The nitrogen dioxide concentrations comparable to the daily reference value are close to the reference value level (70 μg/m3) at one check point in the immediate vicinity of Laajasalontie. Elsewhere the concentrations were below the reference value. PM2,5 - the yearly average concentrations of fine particles were clearly below the yearly limit of 25 μg/m³ in the research area according to both modellings. According to results of the street canyon model, WHO's reference value is exceeded on all check points at breathing height and also on building roof levels. During episodes caused by long-range transported pollution, WHO's daily reference values are exceeded by far in entire Finland. WHO's reference value is considered as a recommendation, and it is not part of Finland's air protection legislation. The detailed land use plan solution is approvable.

13 Conclusions The noise modelling calculations include vehicle traffic according to the estimate network (cars and heavy traffic) and the tramway traffic. The tramway traffic volume equals a situation where the tramway traffic planned for the entire area materialises. The plan regulations for noise have been made according to the worst noise scenario. According to the results of the noise calculations, the residence gardens placed on the side of the sound shadow are protected on Laajasalontie by the closed quarter structure, and the reference value level of 55 db day-time and 50 db night-time is reached in all quarters reserved for residential use. Noise regulations should be issued for the facades towards Laajasalontie, Reposalmentie and Yliskyläntie, to ensure residential comfort. The facades towards Laajasalontie are exposed to average noise levels of more than 65 db and these facades can be subject to noise plan regulations concerning e.g. the direction of flats, placement of balconies and setting the noise level difference of the facades. The noice in the crossings during the vehicle lines will be double-checked and taken into consideration The detailed plan solution was approvable through plan regulations.

14 The detailed land use plan phase included general plans concerning the ground and ground construction, preconstruction needs, management of water resources and flooding, communications and energy management. The ground is favourable for construction and no needs for strengthening the ground have emerged thus far. A general plan for the water resources management has been made for a wider area. Cables need to be moved. On the southern side, a 100 kv ground cable and a district heating trunk line have to be renewed (two district heating pipes). The drafting of the detailed plan is now beeing followed by the street planning services' consulting work (Ramboll Finland Oy) of detailed street planning, phasing and costs. The street space is wide, which makes the phasing and realisation of the street construction doable. Investments - The realisation of the detailed plans causes costs (2018, VAT 0 %) to the City of Helsinki (general plans): Measures to make the plots buildable Street areas and common areas Municipal engineering In total 1-2 million euros 10 million euros 5 million euros million euros - The assessment does not include costs of rail traffic and temporary arrangements. The installation work of the rails are part of the Crown Bridges light rail alliance contract

15 Pirjo Siren Project Director Kruunuvuorenranta-areaproject and Laajasalo / Ilkka Korpi Project Engineer / firstname.lastname@hel.fi