As the name Road Police strongly implies his vehicle mode is a police car - mainly white with a black stripe round the bottom and a pair of moulded red lightbars on the top. A red Autobot symbol sits on the bonnet.
Transformation is typical Micromaster car: fold the back of the car back to become the legs then fold the bonnet back, stand up and bend the arms at the shoulders. The caveat here - as with his team mate Neo-Wheel - is that the bonnet doesn't fold from the neck onto the back, here it fold down from the waist almost as a skirt/cloak behind him.
While Road Police's arms & lower legs retain the white of the car the body becomes the same dark blue as Sixturbo's combined pieces with the waist & face painted in orange. In a lovely bit of sculpting which gives the toy real character the head is moulded with a Police Man's cap on it - see also Discharge for a similar master-stroke ! This extra personality raises Road Police above most of the other Micromaster cars.
As I've said Road Police forms the chest of Sixturbo: take Road Police's vehicle mode and fold the back of the vehicle back to form Road Police's robot legs. Fold the legs up 90 degrees at the hips. Peg Road Police into the chest cavity inside the body piece.
Road Police was only available in Japan in 1992's Operation Combination TF-03 Sixturbo giftset.
The major changes to this toy can be found in robot mode - gone is the orange paint replaced by a much more fetching silver on the face, chest & midrift with a black painted waist. The blue of the robot is a shade lighter too matching the changes made to the head (perhaps they're gang moulded together ?)
It's a subtle change but it makes Micromaster Collection Road Police a better toy than the original.
"Prowl" comes with the same parts as Micromaster Collection Road Police - the combined robot's chest & head.