I have been bike riding 10 times with Siren. 8 of those times I have returned home limping or bleeding. Each time I go out I think I have the issue of cutting in front of the bike solved. Each time Siren finds a way to cut in front of the bike or try to go between the wheels.
Siren understands the basic commands: come, sit, stay, and no. Unfortunely, she only understands when you have her undivided attention (meaning nothing else is around or moving).