To clarify, as one who has now and again been involved in "IRL" activism: blocking a road to hold a protest is a crime, legally-speaking.*
In fact, police SOP for a protest that's beginning to get a bit rowdy is to cite them for just such a crime. "Disperse from the road, or be incarcerated," as it were. Some protests will take this as a sign to move back into sanctioned areas (if it seems strategically appropriate to keep the action going); others will choose to stay and go to prison for the night.
In some sense, it doesn't qualify as "civil disobedience," in the Dr. King sense, unless the latter happens:
"I submit that an individual who breaks a law that conscience tells him is unjust, and who willingly accepts the penalty of imprisonment in order to arouse the conscience of the community over its injustice, is in reality expressing the highest respect for law."
— Dr. King's "Letter from a Birmingham Jail," 1963[1]
In fact, police SOP for a protest that's beginning to get a bit rowdy is to cite them for just such a crime. "Disperse from the road, or be incarcerated," as it were. Some protests will take this as a sign to move back into sanctioned areas (if it seems strategically appropriate to keep the action going); others will choose to stay and go to prison for the night.
In some sense, it doesn't qualify as "civil disobedience," in the Dr. King sense, unless the latter happens:
"I submit that an individual who breaks a law that conscience tells him is unjust, and who willingly accepts the penalty of imprisonment in order to arouse the conscience of the community over its injustice, is in reality expressing the highest respect for law." — Dr. King's "Letter from a Birmingham Jail," 1963[1]
[1]: http://www.africa.upenn.edu/Articles_Gen/Letter_Birmingham.h...
*Edit: At least in the U.S.