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Chronos CHR2LRV traffic lights
One on each side. Runs on 24 V or 230 V with the same code. For tight spaces: ERA80.
ChronosUse case · Private roads
Alternating one-way system
One ramp, a single lane, cars going up and down. Two traffic lights and a control unit decide who goes, with no meetings halfway. Send cars, change mode, test the emergency.
The 3D simulation requires WebGL. Below you'll find how it works, step by step.
3D simulation of the alternating one-way ramp: in Priority mode, with S1 green at rest, loop IN2 calls S2 green after the clearance time.
Drag to rotate · scroll or pinch to zoom
Priority
1/4
Street always clear
Control unit
VIACONTROL
S1
S2
RIPOSO
Rest preset (F3)
Manual controls
Rest: S1 green, S2 red
VIACONTROL · 6-module DIN
How it works
Green to one, red to the other, never halfway.
On a single-lane ramp the problem isn't who goes first: it's making sure two cars don't end up nose to nose in the middle. The clearance phase, all red while the ramp is occupied, is what prevents it.
| Mode | How green starts | When to use it | Sensors |
|---|---|---|---|
| F1 Priority | At rest the F3 state applies. A car on the loop starts the cycle: TSG clearance (all red), TV green to the requesting side, TSG again, back to rest | Residential exits, garage ramps with irregular traffic | Loops, PRAP or photocells |
| F1 Time | Fixed cycle TV1 → TSG → TV2 → TSG | Industrial driveways, building sites, constant traffic | Not needed |
| F1 Status | Green stays on as long as its input is held | Emergencies, oversized loads, manual control from the gatehouse | Button or contact |
| F3 rest V1 R2 | S1 always green, S2 red until the S2 loop requests passage | Exit onto a public road: street traffic doesn't stop. One loop is enough, on the garage side | 1 loop (input of the traffic light red at rest) |
| F3 rest R1 R2 | Both red; green to the side whose loop detects a car | Residential ramps with similar traffic in both directions | 2 loops |
| IN3 alarm | First the clearance time, then state F4 (default: flashing reds) | Fire protection, evacuation | Alarm contact |
Layout
Space to wait, space to exit.
An alternating one-way system works if there is a two-lane area before and after the narrow section: one for those waiting for green, one for those who have just passed.
- Stop line and traffic light on the waiting lane, to the right of approaching traffic.
- Magnetic loop only in the waiting lane, under the stopped car: a car leaving in the other lane doesn't trigger it and doesn't create requests in the wrong direction.
- TSG clearance time calculated on the ramp length: it must be enough for the last car that entered on green to leave the single lane.
The kit
What a ramp needs.
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VIACONTROL control unit
2 traffic lights, 3 modes, 6-module DIN. For systems with several ramps: Saturno, up to 10 traffic lights.
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DA035 detector + 2 loops
Two channels, one per loop, on DIN rail. Alternatively PRAP sensors.
Sensors
Calculate
Cables and consumption
Long 24 V line? Check the cross-section. And how much it costs to keep it on for a year.
Energy impactFrequently asked questions
What property managers and installers ask us.
Are loops really necessary?
Only in priority mode, where green starts on request. In time mode the control unit alternates by itself. Instead of loops, PRAP microwave sensors or photocells can be used.
What happens if two cars arrive from both sides at once?
The control unit serves whoever has been waiting longest first, then the other side. Between the two greens there is always the clearance phase, with both lights red.
Which control unit should I choose?
For a ramp with two traffic lights, VIACONTROL or ACNSEM3L. For multi-storey garages with several ramps and space counting, Saturno, which manages up to 10 traffic lights with master/slave boards connected via RS485.
Can I power the traffic lights at 24 V from the gate control unit?
Yes, Chronos runs on 24 V ac/dc. If the ramp is long, check the voltage drop with the calculator, or use a 230 V supply.
Got a ramp to regulate?
Send us the ramp length, type of access and available power supply: we'll propose traffic lights, control unit and sensors.