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In page Appian Way:

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The road concedes nothing to the Alban hills, but goes straight through them over cuts and fills. The gradients are steep. Then it enters the former Pontine Marshes. A stone causeway of about 31 kilometers (19 mi) led across stagnant and foul-smelling pools blocked from the sea by sand dunes. Appius Claudius planned to drain the marsh, taking up earlier attempts, but he failed. The causeway and its bridges subsequently needed constant repair. In 162 BC, Marcus Cornelius Cathegus had a canal constructed along the road to relieve the traffic and provide an alternative when the road was being repaired. Romans preferred using the canal.[citation needed]