Second unit director Michael D. Moore filmed most of the truck chase. Spielberg had not used a second director before but agreed to it as the scene would take a long time to film being set in multiple locations. Moore completed wider shots where stuntmen stood in for Ford. He closely followed Spielberg's storyboarding but innovated a few shots Spielberg considered improvements. Stuntman Glenn Randall suggested the scene of Jones traversing the underside of the truck. Ford sat in a concealed bicycle seat attached to the truck underside when clinging to its front. One of the convoy cars going over a cliff was a combination of matte painting background and stop motion animation of miniature figures falling out of the car.