reiðihjólinn

It's not important how you got rolling in the first place. The wheels turn and you pick up speed. It's a long slope down. Watch for crosstraffic. Try not to involve other vehicles in your headlong progress. Aim for the flat. If you can brake the thing without flipping yourself over the handlebars, so much the better. Once you've stopped, you might consider chaining it to a parking meter.