No special access issues
Basic rules:
The Hakakallio crag is located within a suburban neighbourhood. There are often families and people walking their dogs going past you. Exercise respect, do not be loud or leave any trash. Brushing is allowed, but minimize removal of moss and lichen as always.
If you get inspiration for new lines be sure to put them up! Almost all sit-starts are still unclimbed.
Access:
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Using public transportation, you can access the crag by bus. The lines 571 and 574 are the ones that are driven most often, but sometimes 614 and 415N goes through the area too. 571 is preferred, because it's stop is a lot closer to the crag compared to the other busses.
The walks from the bus stops range from 400-1000m.
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If you are traveling by car, there are parking spots at Karviaisenkaari. Alternatively, you could apparently leave your car at Hiirimäentie, which is right next to the Crag.