Priority Signs
GIVE WAY
STOP
STOP CHILDREN: a portable sign used by school crossing guards
Regulatory Signs
Turn prohibitions are much the same as we're used to, Chile uses circular cutouts for regulatory signs in the main.
NO ENTRY-This same sign is used in Mexico.
NO OVERTAKING
NO LANE CHANGES
DO NOT BLOCK THE BOX JUNCTION: Something Chile borrowed from the UK. You also find box junctions in NYC. The center of a road junction is painted with a yellow cross hatch, indicating the area to keep clear.
SPEED LIMITS: Maximums are indicated by circular plates,
Minimums by rectangular plates.
Minimum speeds don't apply to roads with speed limits less than 80 km/h
NO HORSE-DRAWN CARTS; NO HAND CARTS: Not a common problem here in the US, but it appears to be a concern in Chile. Things could get icky if either party was to mix it up w/a motor vehicle. These signs are posted at freeways, high speed roads(Autovías), tunnels, etc.
NO SOUNDING HORNS: A common prohibition in Europe. Posted near hospitals, libraries, and 50 meters before "Reduced Noise "zones. This sign also applies to other loud noises.
NO PARKING; NO PARKING OR STOPPING: "Estacionar" is the verb used, hence the "E". As with parking signs anywhere,
this one is subject to modifications as necessary.
This has always been a nit with me, as I find this would be confusing if you didn't speak/read Spanish;
and the NO STOPPING sign is just out there. Who would have a clue what that means in total, even if you know Spanish?
WEIGHT RESTRICTION: OVERALL, BY AXLE
IMPAIRED HEADROOM; IMPAIRED HORIZONTAL CLEARANCE
MAXIMUM LENGTH OF VEHICLE ALLOWED
This lot is pretty straightforward, no matter where you come from.
Chile does you one better, though, and augments this series with
advanced warning signs
OVERTAKING DE-RESTRICTION
ONE-WAY ROAD; TWO WAY ROAD(urban signs)
KEEP RIGHT
MANDATORY DIRECTION TO BE FOLLOWED:
Used at roundabouts; arrow can be pointed upward, meaning "Continue ahead".
GIVE WAY TO ONCOMING TRAFFIC:
Posted at narrow bridges and roads, where only one lane of traffic can pass at a time;
alternately: “PREFERENCIA AL TRANSITO QUE SUBE” in mountainous areas:
GIVE WAY TO UPHILL(CLIMBING) TRAFFIC.
WALK TO THE LEFT(FACING TRAFFIC): Rural advisory for pedestrians.
KEEP RIGHT or LEFT: Used at islands and central resevations. NOT to be used on roundabouts.
PASS (OBSTRUCTION)ON EITHER SIDE
CONTROL POINT: MANDATORY STOP: For nearly anything you can imagine, in the main for Customs posts("Aduana"); but can be applied much like the US CONTROL POINT sign on my DOOMSDAY SINES page.
TYRE CHAINS ARE MANDATORY: A winter sign. Perferably posted where there is space to pull up and put on chains; or turn around and go home :)
BIKES or MOTORCYCLES ONLY; SEGREGATED BIKE/PEDESTRIAN PATH:
The latter can be reversed if needed.
None of these signs are used on a freeway.
SEGREGATED BUS LANE: Can be reversed if neccesary. Not used on freeways.
CAR PARK: Additional legend can be added as necessary as to who can use the car park; however, for special parking circumstances (Handicapped parking; other reseved parking), the NO PARKING sign is to be used with appropriate legend.
RIGHT TURN ON RED LIGHT WITH CAUTION:
RTOR apparently isn't generally allowed in Chile, judging by this sign.
HAIRPIN BENDS: Not used on freeways.
HILLS: Chile lets you know if you're going up or down.
These signs are not posted unless the grade exceeds 6%
ANGLED JUNCTION ON RIGHT:
Since Chile does not specify a MERGE sign,
this is what you get at freeway joins.
Other junction signs follow the US model.
A distance advisory plate is advised if visibilty is limited.
TWO WAY TRAFFIC: also comes in regulatory flavor.
FARM IMPLEMENTS; HORSE CARTS; ANIMALS (Domestic and wild)
PEDESTRIANS IN AREA
ZEBRA CROSSING:
Chile uses the UK style markings and indications for zebra crossings.
Including the Belisha Beacon.
SCHOOL ZONE:
50km/h mandatory limit applies.
SLIPPERY WHEN WET
LOOSE STONES
HIGH VOLTAGE LINE:
posted when high tension lines are 10m overhead.
TUNNEL
UNPROTECTED RIVER:
Not often used. Specified for all classes of road, just the same
Chile is into the dreaded "Traffic Calming" craze, as you can see by the Illustration on the right. The warning signs for "Bumps"  are above, as well as a distance advisory plate. The right hand sign in the above plate is for dips. None of these signs are used on freeways.
MAXIMUM LENGTH RESTRICTION
UNGUARDED LEVEL CROSSING
LEVEL CROSSING WITH GATES
SAINT ANDREW'S CROSS USED AT UNGUARDED LEVEL CROSSINGS(see figure on right)
ROUNDABOUT WARNING
Chile presents the motorist with a full range of LANE TRANSITION
signage-Including warnings for when the road widens...
Pending RESTRICTIONS are indicated on hazard signs. These are used in conjuction with regulatory restriction plates. There is no provision for a distance advisory plate.
CHILDREN PLAYING IN THE STREET: Used only if absolutely neccesary, a mandatory 20 km/h limit applies.
TRAFFIC SIGNALS, GIVE WAY SIGN, STOP SIGN AHEAD
FALLING ROCK ZONE
AIRPORT: Used in the vicinity of airports, where there may be low flying planes near the roadway.
CROSS WINDS: Indicates an area of high cross winds.
UNEVEN SURFACE
UNSPECIFIED GENERAL HAZARD(DANGER): Take Warning!
BARRIER INDICATOR:
Color is variable according to applications.
Can indicate the end of a road or ramp, or can be used at level crossing/toll gate.
ADVANCE GUIDE SIGNS
Green is for ordinary roads
Blue is for freeways
ALTERNATE TURN SIGN-for traffic needing to turn left at a junction where left turns are disallowed.
DIRECTIONAL GUIDE SIGN-For junctions with slip roads
FREEWAY EXIT SIGN-Indicates a slip road leaving the freeway. The ONLY green freeway sign, for reasons not explained.
Countdown markers are also used to indicate an approaching offslip.
EXIT GORE SIGNS(SALIDA)-Freeways; ordinary roads
EXIT COUNTDOWN MARKERS
DISTANCE SIGNS:
Freeways(blue); Ordinary Roads(green). The maximum number of destinations that can be listed is three, the furthest being listed first.
ROUTE NAME AND NUMBER MARKERS:
No specifications exist for cardinal direction plates or arrow plates.
STREET SIGN with ADDRESS NUMBERS
LOCALITY SIGN ON FREEWAY
LOCALITY SIGNS ON ORDINARY ROADS
Diagrammatic examples of directional signage
FREEWAY: Regulations Begin and End.
SLIP ROAD TO RIGHT-Exit from freeway
SLIP ROAD BEFORE ENTRANCE TO FREEWAY
WEIGHBRIDGE-Green version is used on ordinary roads
U-TURN
FREEWAY LAY-BY(PARKING AREA)
EMERGENCY TELEPHONE
TOLL STATION AHEAD-Green version used on ordinary roads.
FREEWAY(AUTOPISTA) SIGNS
MOTORIST SERVICES SIGNS; TOURIST ATTRACTIONS
Blue for freeways, Green for ordinary roads. Services and attraction signs may be grouped together in a single panel as you approach a town. The signs can be supplemented with arrows as needed. There are no minimum distances indicated, signs should indicate services or attractions  "close to the road". And if I read the Spanish correctly, Tourist Attraction signs are USUALLY brown, however, if they are posted in a group with services signs, they can be the same color as the rest of the group(blue or green) this is a sampling of representative signs.
SIGNS FROM THE CHILEAN
"MANUAL DE SEÑALIZACIÓN DE TRÁNSITO"
CHAPTER TWO: "GENERALIDADES DE LAS SEÑALES VERTICALES"
The Chilean road signs and signals manual was originally published in 1982, with the intent of providing a uniform standard of road signage and signalization on a national level. In the last 18 years(This manual was promulgated in 2000), technological and economic advances have affected certain elements of the roads grid, resulting in a need for a new Manual.
To realize this end,  to understand the objectives persued with the new Manual, and to reach a convention with the participation of all the entities concerned, a working group was formed to formulate the theme. The present text is the fruit of the labors and collaboration of the professionals of distinct Ministries connected with the material, the municipalities, the Chilean Army, the universities, and private sector companies.
 
 
 
REGULATORY
SIGNS
The Three main classes of signs. Click to jump to hazard or guide signs.
PALENTOLOGICAL SITE; LOCAL FLORA;
GLACIER(bet you thought that was a volcano, I know *I* did);
CAVE; RELIGIOUS MONUMENT; MUSEUM;
RESEARCH CENTER;
NAUTICAL SPORT;
GENERAL SPORT(another misleading sign, I'd say);
CLIMBING
POST OFFICE; RESTROOMS; MECHANIC, FOOD;
RAILWAY STATION(kinda quaint, eh?);
CAR FERRY; FIRST AID, INFORMATION
TELEPHONE; GAS STATION
ADVISORIES and Mandatory Limits in connection with hazards.
The ADVISORY plate is called for to warn motorists of the safe speed
round a curve.  "Segurida" means "Safety".
It's based on the speed that 85% of drivers would use to round a respective curve.
Mandatory Limits in special cases: As I noted above, school zones and play streets have special limits. This is the appropriate way to post these.
BUS SIGNS
BUS STOP
BUS LANE
LANE FOR BUSSES ONLY
and a sign that doesn't go anyplace else:
PHOTOGRAPHIC CONTROL ZONE shown here in freeway flavor.
This may be some sort of Camera-assisted trafffic control.
These images were RIPPED OFF from the MANUAL DE SEÑALIZACIÓN DE TRÁNSITO of Chile,
Chapter 2 "GENERALIDADES DE LAS SEÑALES VERTICALES". I got the link to this from the newsgroup misc.transport.road.  Virus Express ™ croaked the original post, so the if the person who gave me the original link to this material is out there,  let me know, so you get proper credit. The idea for the page is based loosely on "The Manual of Traffic Signs"
Translations on this page are my own, and are actually, maybe even remotely close to what was being said. You never know.
Nathaniel Porter in the UK suggested the explantion of the ZONA DE CONTROL FOTOGRÁFICO sign,
and it makes more sense than what I had originally written.
If you'd like to see the original downloadable sections of the manual, the links are below. right click and “SAVE AS” if you’re on dialup.
REGULATORY SIGNS
WARNING SIGNS
INFORATION SIGNS
These are all in spanish, obviously.
Actual pictures of Chilean Highways can be found at Froggie’s Magnolia Meanderings"