A collector/distributor road, often abbreviated as C/D road, is a one-way road next to a freeway that is used for some or all of the ramps that would otherwise merge into or split from the main lanes of the freeway. It is similar to a frontage road, and related to the more complex Express-collector systems used in many large cities, but is built to freeway standards. It is used to eliminate or move weaving from the main lanes of the freeway, particularly at cloverleaf interchanges.
In the simplest form, all ramps that would normally touch the freeway are instead shifted outwards to the C/D road. There is still weaving, but it is no longer on the main lanes. More sophisticated designs take some ramps over or under the C/D road, often eliminating weaving entirely. In some countries, such as Croatia, collector-distributor roads are by default used on almost all cloverleaf interchanges.
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