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<p>every 8 to 10 minutes, at most every 12 minutes).  They provide an attractive and permanent service throughout the year, including during school holiday periods.</p>

<p>Lines C1 to C3 are equipped with a signal priority system, dedicated lanes for almost their entire routes, and high-capacity bus shelters fitted with ticket distributors.</p>

<p>The principle of these three lines dates back to 2006, and the creation of lignes fortes Cristalis ("Cristalis strong lines"), designated by the letter C. Cristalis was a model of trolleybus built by</p><p>
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