"A major influence on urban travel is people changing jobs but not homes, even if this involves more travel," it says. The study says 3.6 per cent of households have an income up to Rs 5,000 a month; 28.4 per cent draw Rs 15,000-Rs 20,000; 6.8 per cent Rs 30,000-Rs 40,000. The study has stressed that potential changes in income levels over the next 25 years could have a major impact on the amount of urban travel. For those making up to Rs 5,000 a month, expenditure on transport is Rs 380; Rs 1,414 for Rs 30,000-40,000 income bracket; Rs 1,949 for Rs 40,000-60,000; Rs 2,074 for the Rs 60,000-1,00,000 bracket; and Rs 1,953 for those who draw above Rs 1,00,000 . If you live in the Mumbai metropolitan region, you spend about 8.4 per cent of your monthly income on transport on an average, says a study of around 5,000 households coducted by the Mumbai Metropolitan Region Development Authority to understand commuting trends..