Four Scenarios :

- Option A: no adaptation of the Directive with the modular concept only permitted in National transport, restrictions of 40 tonnes on the maximum weight limit of two vehicle combinations in international transport, 44 tonnes allowed only on combined transport when carrying the 40ft container, the 45ft container overhanging the rear of the semi-trailer by around 12 cm and only permitted in national transport, no harmonised requirements on the size of a fully loaded vehicle.
- Option B: adapt the Directive to permit the modular concept to circulate between Member States with harmonised restrictions and maximum limits.
- Option C: as option B but with some or all specification limits and/or restrictions defined by Member States (room for manoeuvre).
- Option D: as option B but including certain non-modular vehicle combinations.

Six assessment criteria :

- Road safety
- Energy efficiency and CO2 emissions
- Noxious emissions (effect on PM and NOx levels)
- Effect on road infrastructure, bridges, parking of loading transportation
- Effect on Combined Transport and other Intermodal transport operations
- Effect on meeting current and future freight transport demand.