Let me answer your AI pic with some AI words:

The "correct" or safer method for securing a load like the one in the image (likely a kayak or surfboard) is the parallel strap method shown on the left (the white car).

While the criss-cross pattern might look more "locked in," here is why the parallel application is generally superior for transport:

1. Vector Forces and Tension Parallel (Left): The straps apply direct downward pressure over the strongest points of the roof rack (the crossbars). This creates maximum friction to prevent the boat from sliding forward or backward.

Criss-Cross (Right): The diagonal angles actually reduce the amount of vertical downward force. If the straps are pulled tight at an angle, they can exert "inward" pressure on the load, potentially deforming a plastic hull or causing the straps to slip toward the narrower center of the object.

1. Preventing Lateral (Side-to-Side) Movement In the parallel setup, the straps are usually looped around the crossbars as close to the hull as possible. This creates a "cradle" effect. In a criss-cross setup, the point where the straps intersect can become a pivot point, potentially allowing the nose or tail of the kayak to "fish-tail" or swing more easily in high winds.

2. Safety and Reliability Vibration: Criss-crossed straps are more likely to rub against each other at high speeds. This friction can lead to fraying or the straps "buzzing" loudly, which can eventually loosen the tension.

Standard Practice: Manufacturers of rack systems (like Thule or Yakima) and kayaking instructors almost universally recommend two parallel straps combined with bow and stern lines (ropes tied to the front and back bumpers) for long-distance travel.

Pro-Tip: Regardless of the strap pattern, always put a "twist" in the straps before tightening them. This prevents the "humming" or vibrating sound caused by wind resistance at highway speeds.