Time stopTime = simulator.getSimulatorTime();
        // System.err.println("Entering sendGTUPositionsToAimsun: simulator time is " + stopTime);
        AimsunControlProtoBuf.GTUPositions.Builder builder = AimsunControlProtoBuf.GTUPositions.newBuilder();
        for (GTU gtu : this.model.getNetwork().getGTUs())
        {
            AimsunControlProtoBuf.GTUPositions.GTUPosition.Builder gpb =
                    AimsunControlProtoBuf.GTUPositions.GTUPosition.newBuilder();
            gpb.setGtuId(gtu.getId());
            DirectedPoint dp;
            try
            {
                dp = gtu.getOperationalPlan().getLocation(stopTime);
                gpb.setX(dp.x);
                gpb.setY(dp.y);
                gpb.setZ(dp.z);
                gpb.setAngle(dp.getRotZ());
                gpb.setLength(gtu.getLength().si);
                gpb.setWidth(gtu.getWidth().si);
                gpb.setGtuTypeId(Integer.parseInt(gtu.getGTUType().getId().split("\\.")[1]));
                gpb.setSpeed(gtu.getSpeed().si);
                builder.addGtuPos(gpb.build());
            }
            catch (OperationalPlanException exception)
            {
                exception.printStackTrace();
            }
        }
        builder.setStatus("OK");