But the key ingredient in their longevity was a brilliant system of drainage that was enhanced by a slight curvature as well as by the road’s elevation above the surrounding countryside.
इतिहासकार हिंडली के अनुसार, इस कार्यक्रम ने जर्मनी को “दुनिया का पहला मोटर महामार्ग जाल ” प्रदान किया ।