"Hi Daniel,  Thanks, it works. I have to change some design so as to keep all the buttons clickable on each layer. "

"Thanks, Wendy.  I didn't notice the trigger order before. It works! "

"Hi Phil,  Thank you for the information. What you mean is that the reset to initial stats is not workable in the case if I use variables..."

"Hi Tom,  Thanks for correcting. I set them wrong and didn't notice that. "

"Hi Walt,  Thank you so much. I went through the trigger you suggested and tried them on my project and they all work~! "

"Thanks, Walt! It works!"

"I solved and have the trucks go in order. Thank you!"

"Hi Walt,  I changed the trigger, and it half-works. :-) When truck 1's motion path finished, truck 2 moves. And when truck 2's motion p..."

"Hi,  I am facing the similar situation... Can anyone help? The design is to click 'GO', then the rectangle is hidden and the truck show..."

"Thanks Walt.  I will try your idea next time. Also, will consider to change the truck color. "

"Thanks, Mr C.  It works to put a ''Pause Timeline'' on ''This Slide'' ''When the Timeline Starts''. "