http://ekonomi.kompasiana.com/manajemen/2011/07/13/antara-pegawai-negeri-dan-pegawai-swasta-bedanya-apa/
The rules/regulation for travel allowance is needed for the person (public officers and/or private employee) to do their job at other city other than their home town/office and also important for the organisation that assigning them (local government, central government, private company, etc). The main purpose of this allowance is to enable the person assigned to function with "acceptable" travelling supportive maters i.e. accommodation, meals, phone, laundry, etc. The specification of how much is the acceptable amount is varies according to the capacity of the person and the organisation itself. Comparing one to another is good as benchmark but may lead to dissatisfaction if found others better.