. 2023 Nov 6;9:e1676. doi: 10.7717/peerj-cs.1676

Algorithm 2 . Speed-control policy.

Data: R, a set of n road Ids considered within the emissions-controlled area. VRS, variable road speed factor. RMS

_{r o a d I d}

, Road Maximum

Speed.

T S_{r o a d I d}

, target vehicle’s speed.

Result: Vehicles adjust its current speed to the

T S_{r o a d I d}

1 for each roadId

\in

R do

2 update RSD

_{r o a d I d}

reading;

3 compute avrg(RSD

_{r o a d I d}

);/* Updated every 15 minutes.

4 if avrg RSD

_{r o a d I d} >

AQG then

V R S = T S_{r o a d I d} / R M S_{r o a d I d};

6 generate AQE message;/* AQE messages include roadId, roadLoc,

and VRS factor.

7 RSUs broadcast AQE messages;/* I2V communication.

8 end

9 end

/* Vehicles Premises.

10 if AQE message received then

11 if

N o d e_{C u r r T i m e} - A Q E_{T i m e s t a m p} > T T h r e s h o l d

then

12 from AQE message GET roadId, roadLoc, VRS factor;

13 if

C a r_{r o a d I d} == A Q E_{r o a d I d}

then

C a r_{S p e e d} = V R S * R M S_{r o a d I d}

;/* Set current vehicle′s speed to the

target speed on roadId (

T S_{r o a d I d}

15 end

16 if

A Q E_{h o p s} \leq M a x_{h o p s}

then

17 forward AQE message/* V2V communication, see Fig. 2.

18 end

19 end

20 end