Route main road 100b
The trunk road 100b , or RN 100b , was a trunk road French connecting Gap to RN 100 on the level of Saint-Vincent-the-Forts.
Following the reform of 1972, it became RD 900b .
Of Gap at Saint-Vincent-the-Forts
The common crossings are:
Before 1961, the RN 100b connected Selonnet to Saint-Vincent-the-Forts, via the collar Midsummer's Day. This layout was then taken again by RN 100.