The aim of this contribution is to discuss selected historical issues of changes in urban layout of historic towns in East Prussia, aiming at their regulation in terms of communication and traffic. Especially, Author focuses his attention on a few key problems, namely: regulations from the turn of the Eighteenth and Nineteenth Centuries, resulting in demolition of medieval town walls and expansion of new suburban districts; plans and corrections of street network from ca. 1900, including ring roads and bypasses. Third and the last problem discussed in this essay is related to drammatic alterations and reconfigurations of historic towns infrastructure and urban space in the period after the closure of WWII, when most of East Prussian towns were included in the new province of Poland. All of historical problems in question are connected by the very issue of impact that discussed changes have had on historic urban layouts of towns.