[MP2]

pawn Код:

stock GetNearestVehicle(playerid, Float:max_range = 99999.0)
{
    new Float:closestDist = max_range;
    new closestVehicle = 0;
    new Float:thisDist;
    
    new Float:x, Float:y, Float:z;
    GetPlayerPos(playerid, x, y, z);
    
    for(new i=1; i<=MAX_VEHICLES; i++)
    {
        thisDist = GetVehicleDistanceFromPoint(i, x, y, z);
        if(thisDist < max_range && thisDist < closestDist)
        {
            closestDist = thisDist;
            closestVehicle = i;
        }
    }
    return closestVehicle;
}

Not tested, but it compiles, and it should work.

If it returns 0 (invalid vehicle ID as they start at 1) it means there's no vehicles within range.