Salat under unusual conditions

The Quran informs us that one may pray while walking or riding under unusual circumstances. This means under normal conditions, one should be stationary to perform Salat.

[2:239] Under unusual circumstances, you may pray while walking or riding. Once you are safe, you shall commemorate GOD as He taught you what you never knew.

فَإِنْ خِفْتُمْ فَرِجَالًا أَوْ رُكْبَانًا فَإِذَا أَمِنْتُمْ فَاذْكُرُوا اللَّهَ كَمَا عَلَّمَكُمْ مَا لَمْ تَكُونُوا تَعْلَمُونَ