Latvia has successfully met the EU requirements in road transportation and introduced in legislation main conditions regarding to technical parameters of road transport vehicles. Legislative acts of EU determine that Member States may allow circulation in their territory of vehicles or vehicle combinations for national transportation of goods, which are not in conformity with the some characteristics of Council Directives. Currently there are no legal rights to use vehicle combinations longer than 18.75 metres for haulage of divisible cargos in Latvia. Long size vehicle combinations are considerably gainful and can contribute to the target of reduction of noise, road wear and pollution emitted by heavy vehicles. Positive influence on road safety can be achieved. Based on commercial computer software research was made to find out solutions for better manoeuvring criteria of the modular vehicle combinations. Analysis of literature, calculations and practical surveillance of vehicle overtaking manoeuvres on roads has been done.