Bumps and Walls Analogy For a search engine to access and read your content successfully you must ensure you avoid any factors that may impede the crawlers' chances of accessing your content. These are commonly known as Speed Bumps and Walls. As search engines rely solely on the hyperlink architect of the web to find new documents and content as well as updating any changes since its last visit (to view when your site was last visited you can use a program like Google toolbar and 'view cached snapshot of page'). A bump is described as complex links and deep site structures with little original content; usually anything more than 3-4 links into a site is too deep for a search engine to crawl effectively as it slows down there indexing process. A wall is described as data that cannot be accessed by spider able links.