Wrong way: Safer
Blocking the entrance improves traffic flows and allows the manned main gate to instruct drivers of the best routes to take. The addition of maps and building numbers throughout the site helps visitors and delivery drivers manage their route through the site.
Helping people navigate the site not only makes the site safer, but improves traffic flow and ensures visitors as well as delivery drivers find their destinations quickly and easily. Reducing the number of entrances improves site security as well as safety.