i was on my eskateboard in the city and crossed the road to another corner and travelled down the road using the pavement turning at the next corner i entered a car park adjacent to a Hungry Jacks. I stopped to take a call. spoke for a min if that then i carried on my journey. As i left the car park a guy standing on the pavement said "hi. cool skateboard" i replied "thanks" and carried on my journey. before i got to the next corner a car suddenly sped past me and pulled up sideways in front of me (like starsky and hutch) the driver yelled at me to stay there. do not move. i realised that the occupants were police, uniformed in an unmarked car. as they came towards me i asked them what do they want why are you stopping me. The officer who yell'd at me replied "you ran a red light about 4 blocks back" they then asked me what i was doing there, asked for my name address date of birth which i provided and then asked to see in my bag. This seemed odd seeing as i had only ran a red light and i refused. They then asked why was i in the car park, who was i talking to on the phone and why was i talking to the guy on the street, i said i stopped to take a call. the guy just asked me about my eskateboard. The cop again requested access to my property i again refused . He then said that they had observed me from a street that was a few blocks back. they then watched me take call in car park leave and speak to the stranger. After i refused again to a search and this time he said that they had reasonablesuspision