I used to work at a place where these things would cross the road.
I used to stop for them, sometimes having to wait a couple of minutes or more. Then I realized that if I slowly move up on them, they will get out of the way quicker--like in 10-15 seconds.
Then I realized that if I slowly move up on them, they will get out of the way quicker--like in 10-15 seconds. You don't say, but you probably have observed that if you startle them to flight suddenly, you can take your car to the car wash. When startled, they can leave a yard full of their crap which is as large as a small to medium size dog. Also note, The non-migratory birds will have several flocks of little goslings in a summer.