Road types are collections of links (or sections) that have similar profiles for volume variations through the year, due to seasonal variations. The use of seasonal variation profiles is recommended to be a deliberate and considered approach by the asset manager. As such, the default type would be a single road type with a default adjustment factor of one. From there, there can be increasing levels of complexity and granularity as the asset manager chooses for specific part (or all) of their network.

Traffic groups are collections of links (or sections) that have similar profiles for typically land use or ONRC class. Their purpose is to utilise smaller sample sizes to address links with no count history to update.

It is recommended that traffic groups are maintained. It would essentially be a manual process to generate these initially. There are options to automate the task, albeit outside any proposed RAMM tool. Any process for traffic groups within RAMM would be at a very high level and not reach the benefits of a realistic study of traffic mix. Grouping is a good method of covering vehicle mix and similar performing links. It is therefore encouraged as part of a recommended practice. It is accepted assuming consistent growth within a group is likely not realistic. However, grouping does serve other purposes such as traffic mix. Grouping can be adopted to the level the user chooses including just having one!