Walking to school is a healthy mode of travel, yet most of the children do not start their day with this activity. The cross- sectional survey used a sample of parents of children (9-12 years old) from public primary schools in Tehran; to examine if socio-economic factors moderate the relationship between parental perception of traffic safety and children travel to school. Results from Multinomial Logistic Models showed that, the numbers of cars in a household and household income are the two main moderators. The findings also showed parental perceptions of traffic safety vary across different socio-economic status areas.