Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/17/84; site hplabsb.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!harvard!talcott!panda!genrad!decvax!tektronix!hplabsb!hodor From: hodor@hplabsb.UUCP Newsgroups: net.bicycle Subject: Re: car-sensors at traffic lights Message-ID: <3037@hplabsb.UUCP> Date: Thu, 8-Aug-85 13:46:28 EDT Article-I.D.: hplabsb.3037 Posted: Thu Aug 8 13:46:28 1985 Date-Received: Mon, 12-Aug-85 22:29:32 EDT References: <1043@umcp-cs.UUCP> Distribution: net Organization: Hewlett Packard Labs, Palo Alto CA Lines: 27 > What do y'all do when you're stuck at a traffic light that won't turn > green for you 'till something with enough mass to trip the traffic > sensor comes along, but there are no cars coming the same direction you > are? > -- > Fred Blonder (301) 454-7690 > harpo!seismo!umcp-cs!fred > Fred@Maryland.ARPA I have been able to trip most car-sensors at traffic lights. Most of the new ones are metal detectors. The problem is to know where to ride to trip them. All of the ones that I know of are made by cutting a slot in pavement and placing a wire in the slot. The slot is covered by tar. The pattern of the tar is the key. There are two configurations that I know of: 1. The "8" configuration. This looks like a number 8. To trip these ride your bike over the center line of the eight. This is the most sensitive part of the metal detector. 2. The single "O" configuration. This configuration is sometimes the more difficult to trip. It is usually less sensitive. If it can be tripped by the bicycle you need to ride over the edge of the circle. I hope these hints help. Happy "tripping." Ken Hodor hplabs!hodor