Editing Grid plan (section)

{{short description|Urban plan in which city streets form a grid}}
[[File:Urban Plan of Palaio Faliro.jpg|right|thumb|upright=1.5|A simple grid plan from 1908 of [[Palaio Faliro]].]]
[[File:Pori 1799.JPG|right|thumb|300px|A grid plan from 1799 of [[Pori]], [[Finland]], by Isaac Tillberg.]]
[[File:Streetmap of Adelaide and North Adelaide.png|thumb|300px|The city of [[Adelaide]], South Australia was laid out in a grid, surrounded by gardens and parks.]]

In [[urban planning]], the '''grid plan''', '''grid street plan''', or '''gridiron plan''' is a type of [[city]] plan in which [[street]]s run at [[Angle#Types of angles|right angle]]s to each other, forming a [[wikt:grid|grid]].<ref>{{cite journal | doi=10.1080/17538947.2023.2243901 | title=Street network patterns for mitigating urban heat islands in arid climates | date=2023 | last1=Chenary | first1=Kimia | last2=Soltani | first2=Ali | last3=Sharifi | first3=Ayyoob | journal=International Journal of Digital Earth | volume=16 | issue=1 | pages=3145–3161 | bibcode=2023IJDE...16.3145C | doi-access=free }}</ref>

Two inherent characteristics of the grid plan, frequent intersections and orthogonal geometry, facilitate movement. The geometry helps with orientation and [[wayfinding]] and its frequent intersections with the choice and directness of route to desired destinations.

In [[ancient Rome]], the grid plan method of land measurement was called [[centuriation]]. The grid plan dates from antiquity and originated in multiple cultures; some of the earliest [[planned cities]] were built using grid plans in the Indian subcontinent.