What is a recommended shelter from a nuclear blast?

Deep foxholes are recommended shelters from a nuclear blast due to their ability to provide significant protection from the blast wave, heat, and radiation associated with a nuclear detonation. The earth surrounding a foxhole acts as a natural shield, absorbing and deflecting harmful radiation and reducing the impact of blast pressure. Unlike other options, deep foxholes can be dug to a depth that offers a greater level of safety and security, especially in terms of protection from fallout and other secondary effects of the explosion.

In contrast, open fields lack any protective structure or materials that could shield individuals from the intense heat and radiation. Wooden structures, while providing some cover, are generally not robust enough to withstand the effects of a nuclear blast and would be highly susceptible to fire and structural failure. Concrete highways, while stronger than wooden structures, still do not offer the necessary depth or earth coverage needed to effectively protect from radiation and the full force of a nuclear explosion. Thus, deep foxholes are the most effective choice for shelter in this scenario.