About 80% of people oppose an increase in taxi fares and find the vehicles to be in poor condition, according to a survey by the Department of Land Transport.
Thirty-two percent do not like it that a majority of taxi drivers reject some passengers, while 40% said they wished taxi drivers were more polite.
Thanee Sueblerk, the director-general of the department, said the responses will be used to draft regulations for public transportation, including policies on vans and minibuses.
The survey's questions on public passenger vans showed that 49% of Thais want improvements in the quality of the vehicles, while 46% find many van drivers rude. However, 70% of respondents said they thought fares were reasonable. Respondents wanted improved van safety and reduced speeds.
About half of the respondents believed that motorcycle taxi fares were unreasonably high. While 73% approved of the condition of the bikes, 40% would like to see improvements in driver behaviour.
The survey was conducted throughout the month of August, with 1,950 respondents.