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At least 60 years ago, road construction agencies began to consider building systems of controlled access, grade-separated, multiple lane roads, now called freeways, through and around the large cities of the economically advanced countries of the world. These roads were a response to the widespread, rapidly increasing adoption of the automobile, motor bus and motor truck as a new form of urban and interurban transportation. This motor vehicle/road technology was competing effectively with and beginning to dominate the earlier railroad-based passenger technology, which took the specific form of commuter railroads, elevated and subway lines, and various types of tram/streetcar systems. These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Stored only when both papers are in the corpus — 23 citations exist upstream.
Papers that cite the same references — the relational fallback while embeddings are still backfilling.
Imported from OpenAlex (CC0) — nothing here is generated.