The light from the vehicle can reflect on white clothing so it's easier to see them.
Yes.
Yes!
Yes! If it's a "plain" dress, you'll need to accessorize it.
The police ANYWHERE legally use concealment and/or disguise in order to enforce speed and traffic laws.
white
use detergent with a sponge
Yes, if you're planning an immediate honeymoon!
Never ever use bleach on silk!
If you mean another color bled onto your white dress in the wash, no. Don't use bleach unless the dress is safe for bleach. You can only use bleach on 100% cotton. You can try using Ritz Color Remover. It's made to take out dyes.
Eg, "The police officer stood in the middle of the road, diverting traffic away from the accident."
Jenna imbrued the beautiful white dress she had on with barbeque sauce by accident.
A police officer can signal traffic to stop by using hand signals or using their patrol vehicle's emergency lights and siren. They may extend their arm out to the side with their palm facing the traffic, indicating that it should stop. They may also use their police vehicle's lights and sirens to grab the attention of the drivers and indicate they need to stop.