Template:Mentostop (russian милиция=>менты + автостоп) is a funny and extreme way of h-hiking. Mentostop effective in some poor countries with very strong police and military aspect. Could be extremely effective after terrorist attack and less effective after peaceful period. In fact people in unstable countries tended to help or save another crazy foreiner crossing their land from another terrorist attack. Why should you refuse them? Let the people feel them as a part of helping proccess.
Before ask a policeman be sure that your documents are complitely OK.
Better to know at least elementary Russian language.
Countries with effective Mentostop
Police in Uzbekistan are most kind and helpfull among all Central Asia (2010). After checking your ID always trying to get a comfortable bus for you. Distances up to across all country just wait for proper bus.
Every policeman is ready to help you on the road. Sometimes they just carry you to the next checkpoint and ask local policemans to get a car for you. Also could offer some food or give some money (up to 5USD :)).
Since campaign against corruption was started policemans became freindly and helpfull. Usually triing to get a bus for you. Lifts across the country available. 1000+ km is not a limit. Best way to get a ride for a nighttime.