11. (5 points) The two ends of a bus route are station $A$ and station $B$. The bus company has the following rules:
(1) Each bus completes a one-way trip, including stops at intermediate stations, within 50 minutes, and stops for 10 minutes when it reaches either end.
(2) Both station $A$ and station $B$ dispatch a bus every 6 minutes. Therefore, the minimum number of buses required for this bus route is.
【Analysis】Assuming the first bus departs from station $A$, it takes 50 minutes to complete a one-way trip to station $B$, and then it stops for 10 minutes before it can depart again to return to station $A$. By this time, station $B$ has already dispatched $60 \div 6=10$ buses, so station $B$ does not need to dispatch any more buses. Similarly, station $A$ also needs to dispatch 1 bus. According to this, we can calculate the answer.

【Solution】Solution: $60 \div 6 \times 2$,
$$
=10 \times 2 \text {, }
$$
$=20$ (buses);
Answer: The number of buses required on this bus route is at least 20.
Therefore, the answer is: 20.