Sitraffic Smart Detection - Made-to-measure traffic detection for your traffic management

High accuracy data is essential for effective and safe traffic management. And to get this, you need traffic detectors. Each respective detector must match actual requirements. Sitraffic Smart Detection by Siemens offers a whole range of traffic detection devices – customized to suit the requirements of your traffic network.

  • Sitraffic SLD4: the tried and tested loop detector

  • Sitraffic Heimdall stopline detector: for the detection of cars, trucks and bicycles at intersections

  • Sitraffic Heimdall remote detector: for the control of incoming traffic at intersections

  • Sitraffic Heimdall Traffic Data: for the detection of vehicles to monitor the traffic situation

  • Sitraffic Heimdall pedestrian detector: for the extension of green light phases in case of crowds

  • Heimdall pedestrian waiting zone: for pedestrians on the sidewalk waiting for green light

Infrastructure challenges which can be addressed with Sitraffic Smart Detection

Growing traffic volumes, increasing air pollution and higher safety requirements: A mobility solution alone will not resolve all your infrastructure challenges. It will, however, contribute to making your city or community more modern, attractive and environmentally friendly.

Here is an overview of how Sitraffic Smart Detection can assist you:

  • You’ll receive high accuracy data regarding traffic loads in your city or community.

  • You’ll be able to improve your infrastructure planning based on that information.

  • You’ll effectively counteract tailbacks and rising traffic volumes.

  • You’ll decrease waiting times at intersections.

  • You’ll be able to actively capture and control the number of cyclists in your city or community.

  • You’ll improve safety at pedestrian cross walks.

Sitraffic SLD4

Tried and tested loop detector with a whole new range of applications

Induction loop detectors by Siemens have been delivering reliable traffic data for over 30 years. Sitraffic SLD4 combines the condensed know-how of three decades with state-of-the-art technology and a whole new range of applications.

High detection rates for all applications

  • High detection rates for all loop types (small/large, old/new, with short/long cable access)

  • Multiplexing places all four loops of a detector on the same frequency

Easy to operate via DIP switch or PC

  • Basic parameters can be set up via DIP switch

  • Detectors are quickly and easily installed and commissioned for virtually any system

  • The most complex applications are easily implemented

Compatible with the entire Sitraffic world

  • Sitraffic SLD4 integrates seamlessly into Siemens control devices and route stations

Why you should deploy Sitraffic SLD4

  • Reliable detection for optimized traffic management

  • Independent of ambient conditions

  • Automatic sensitivity adjustment

  • High flexibility in terms of loop frequencies (true multiplexing)

  • Easy installation

  • USB interface

  • PC parameterization with user-friendly UI

Sitraffic SLD4 – Technical details

Input voltage

10 to 32 V DC

Power consumption

0.75 W/LEDs when OFF, 1.0 W/LEDs when ON


160 × 100 × 25 mm (W × H × D)

Temperature range

–25 to +80 °C

Loop inductivity

20 to 2000 μH (including connection line)

Length of connection line

0 to 300 m
(depending on the application, line lengths
 > 300 m possible)

Loop frequency

30 to 120 kHz


0.004% to 1.0% dL/L

Speed range

0 to 250 km/h (0 to 155 mph)


• Open collector outputs
• Max. voltage 35 V DC
• Capacitance: 50 mA for a voltage drop of max. 2.5 V
• Pulse 100 mA/10 ms

DIP switches

• Sensitivity
• Maximum presence time
• Loop frequency
• Mode (single loop, double loop TLS Type I or II)


• USB (PC interface)
• RS485 (Sitos)


• EN 50293
• EN 60950
• ETSI EN 300-330

Sitraffic Heimdall

Quick detection using state-of-the-art radar technology

In Sitraffic Heimdall, Siemens has developed an overhead detection technology as a new alternative for modern traffic and pedestrian control. The core piece of each device is a planar radar antenna and digital signal processor. All Heimdall products are tailor-made for specific use cases. But they all have one thing in common: They are easy to install and highly cost-effective.

  • Stopline detector – for the detection of vehicles at intersections

  • Remote detector – for the detection of vehicles within a 30 m radius

  • Traffic Data – for the recording of vehicle data

  • Pedestrian detector – for optimized green light phases for pedestrians

  • Pedestrian waiting zone – for pedestrians waiting on the sidewalk

Heimdall stopline detector – for the detection of vehicles at the stop line

  • To monitor vehicles at the stop line, together with vehicle count applications

  • Efficient detection and monitoring of vehicles at signal-controlled intersections

  • Detection of standing vehicles

  • Vehicle presence can be set via configuration switches in fixed increments of five to thirty minutes

Heimdall remote detector – for the detection of vehicles in a 30 m radius

  • For the detection of vehicles at signal-controlled intersections

  • Single lane vehicle detection based on CW Doppler technology

  • Narrow detection range, lane selective detection up to 30 m

  • Differentiates direction of travel to suppress possible toe-out effects

Heimdall Traffic Data – for the recording of vehicle data

  • Presence detection of vehicle data

  • Counter and speed data

  • Information on vehicle length and class

  • Data is transmitted to a route station or control device via a serial interface

Heimdall pedestrian detector – for optimized green light phases for pedestrians

  • Reliable detection of pedestrians at cross walks

  • Pedestrian green light phases can be set to a short time value and be extended as needed

  • Improved signaling quality

Heimdall pedestrian waiting zone – for pedestrians waiting on the sidewalk

  • Detection of pedestrians waiting on the sidewalk

  • At traffic light controlled cross walks

  • Two integrated antennas for outstanding detection performance

  • No complex and costly configuration software

Why you should deploy Sitraffic Heimdall

  • High detection rates, seamless installation

  • Easy configuration – no need for costly and error-prone
    configuration tools for PC or PDA

  • Mobile device interface without any need for specialist software

  • Optimized performance under any ambient condition – incident light, deep shadow, day, night, fog, rain

  • Long service life, low maintenance requirements

  • Easy replacement of existing devices

  • State of the art 24GHz radar technology

Sitraffic Heimdall – technical details

All Heimdall detectors


EMV acc. to EN50293, radio approval acc. to EN300440

Supply voltage

24 V AC ± 20% (48 bis 63 Hz) or 24 V DC ± 20%

Supply current (typical)

143 mA (AC) or 113 mA (DC)

Microwave frequency

24.05 GHz to 24.25 GHz; 13.4 GHz to 14.0 GHz (pedestrian detection)


150 mm (h) × 135 mm (w) × 90 mm (d), to the bottom of mounting bracket


Less than 1.6 kg

Specific detectors

Stopline detector

Vehicle approach speed

Approx. 3 m from stopline

Näherungsgeschwindigkeit des Fahrzeugs

Not applicable (stationary vehicle detection system)

Maximum presence time

30 min, configurable via DIP switch settings or terminal

Detector location

Either on lateral signal pole or above the lane; angle to the horizontal line > 45°

Detector mounting height

3 to 8 m

Single Lane Vehicle Actuation

Detection zone

10 to 35 m from the stopline

Vehicle approach speed

At least 8 km/h; configurable detection direction: approaching, receding, or both

Detector location

Either on lateral signal pole or above the lane

Detector mounting height

3 to 10 m

Traffic Data detector

Detection zone

Detection of individual vehicles below the detector; detection zone approx. 3 × 3 m

Individual vehicle data

Speed, length, vehicle class

Detector location

Above the lane, e.g. on sign gantry

Detector mounting height

5 to 8 m

On-Crossing detector

Detection zone

Up to 12 m

Crossing width

Typically up to at least 4 m

Pedestrian minimum threshold speed

< 0.5 m/s

Detector location

Either side of the crossing – no interference between units (no special adjustments needed)

Detector mounting height

3.3 to 4.5 m

Curbside detector

Detection zone

Wait areas up to 4.5 m wide (DIP switch setting for short and long wait areas)

Wait area width

Typically 1.0 m (when adjacent to pedestrian push button, typically 2.0 m)

Detection of pedestrians even when fully static


Detector location

On the same pole as associated pedestrian push button

Detector mounting height

3.3 to 4.0 m