HARD ROADTRAFFIC AND CHASE RULES
These Traffic and Chase rules give detail to every possible aspect of overland travel, from random traffic generators to the reactions of other drivers, to common road hazards. Obviously using all the rules at once may bog down your game, feel free to pick and choose the rules as you see fit to suite situational needs.
Random Traffic GeneratorCars sharing the road in 10 round (30 second) increments.
1D10 Result 1 Road Clear 2-6 1D6 Vehicles 7-9 2D6 Vehicles 10 3D6 Vehicles Daytime (normal hours 5-7AM, 9AM-3PM and 6PM to 9PM) default Rush Hour (7AM-9AM and 4PM-6PM) doubles the number of vehicles rolled Nightime (9PM-12PM) 1/2 of the vehicles rolled (round down) Late night/early morning (12PM-5AM) 1/3 of vehicles rolled (round down) High population Area x2 Vehicles rolled Rural Area 1/2 vehicles rolled (round down) Desolate area (interstates between cities, extreme back roads, etc...) 1/4 vehicles rolled (round down) Dirt Roads raise difficulty modifier level by 1 Road in severe disrepair raise difficulty modifier level by 2 Light rain, snow -10% of vehicles on road (round down), treat speed limit as if -15 km/h posted, increases difficulty modifier level by 1 Heavy Rain, Snow, Ice, fog, and Sandstorm -50% of vehicles on road (round down), treat speed limit as if half posted, and Difficulty Modifier level raises by 2
For every 2 vehicles over 5 per lane in an increment, treat posted speed limit as being 10% lower in that lane.
Roll on the table above once for traffic moving in your direction, and again for the traffic in the oncoming lanes.
The default is for a 4-lane road (2 lanes moving your direction, 2 lanes oncoming). For every additional lane add 1D6 vehicles.
Traffic Random Vehicle Generator
1D10 Vehicle 1-2 Motorcycle 2-3 Compact Car, Midsize or Car Sedan 6 Luxury Vehicle or Sportscar 7-8 SUV, Pickup Truck or Minivan 9 Large SUV, Van or Light Truck 10 Semi Truck or Large RV
Traffic is always assumed to be going the posted speed limit (or the speed limit as modified by road, traffic, and weather conditions). Individual traffic however, may deviate by 1D10 km/h over or under the posted speed limit for an addition realistic touch).
For every 10 km/h difference over the posted speed limit, drop the re-roll time by 1 round (3 seconds), to a minimum of 1 round (3 seconds). Meaning if you are going the posted speed limit of 65 km/h, then you only re-roll the traffic generator every 10 rounds (equal to 30 seconds game time). However, if you are doing 110 in a 65 km/h zone, then you re-roll traffic every 3 rounds (12 seconds). If you are doing 150 or more in a 65 km/h zone, you re-roll every round (3 seconds), same as if you are doing 185 km/h in a 110 km/h zone.
Km/h over posted speed Re-roll times modified by speed Km/h over posted speed Re-roll times modified by speed Posted speed 10 rounds (30 seconds) +50 km/h 5 rounds (15 seconds) +10 km/h 9 rounds (27 seconds) +60 km/h 4 rounds (12 seconds) +20 km/h 8 rounds (24 seconds) +70 km/h 3 rounds (9 seconds) +30 km/h 7 rounds (21 seconds) +80 km/h 2 rounds (6 seconds) +40 km/h 6 rounds (18 seconds) +90 km/h 1 round (3 seconds)
OTHER TRAFFIC AND ROAD RULES
Random side street availabilityFor every traffic re-roll increment (roll for traffic at each street only if characters are turning or that street has right of way).
Roll 1D6 City Urban Highway Rural Highway Rural Road (50% chance side road is dirt) 1 No No No No 2 1 No No No 3-4 2 1 exit ramp No 1 road 5 3 1 exit ramp No 2 roads 6 4 2 exit ramp 1 exit ramp 3 roads
Chase PositionFor every 15 km/h over the speed of traffic an individual vehicle is traveling, it may pull ahead at 1 car length per round. For vehicles involved in a chase or race, this rule only counts towards vehicles moving at the posted (modified) speed limit. Involved vehicles move relative to traffic, their position relative to each other is determined by individual speed, acceleration, and other modifiers.
Round by RoundAcceleration : roll a drive check, on a successful roll, every point over the target difficulty allows you to accelerate 10 km/h. Failure of this roll indicates a character has become nervous or unsure, and decelerates by 10 km/h instead. Alternatively, at any time a a character may opt to decelerate safely at up to half his listed deceleration.
Making a full deceleration (equating to slamming on the brakes) requires a roll 1 difficulty level higher than the standard for driving (with modifiers for speed, weather, road conditions and traffic included). Slamming on the brakes also forces any vehicles behind you and within your threat range, to make an immediate maneuver roll with additional modifiers due to distance included.
Threat RangeEvery 15 km/h a vehicle is traveling increases the threat range by 1 vehicle length.
Vehicles in a threat range have their difficulty modifier level increased by 1 for every vehicle length they are nearer to the the vehicle in front of them.
When a vehicle gets within 20% of its maximum speed, increase the difficulty modifier by 1 level.
For every 30 km/h over 130, increase the difficulty modifier by one level (add or reduce 15 km/h to the 130 for every bonus or minus to maneuverability a vehicle possesses).
TurningThis is the speed your vehicle must reduce to in order to turn without penalty, for every point of maneuverability, you may increase this speed by 10 km/h (for the purposes of this, count all 0's as being -10 consecutively). If top speed is zero, the vehicle effectively comes to a complete stop.
Radius Top Speed Radius Top Speed 15 degree 110 km/h 105 degree 15 km/h 30 degree 95 km/h 120 degree 0 km/h 45 degree 80 km/h 135 degree 0 km/h 60 degree 65 km/h 150 degree 0 km/h 75 degree 50 km/h 165 degree 0 km/h 90 degree 30 km/h 180 degree 0 km/h
Reactions of non involved drivers to vehicles involved in chaseRoll 1D10 on the following chart whenever an involved vehicle makes any maneuver that would cause a non-involved vehicle to react.
1D10 Reaction Result 1 Driver panics, loses control of vehicle (roll on vehicle fumble table) 2 Driver not paying attention, cannot react or evade 3 Road Rage, driver purposely does whatever he can to hinder involved vehicle, 20% chance he will join chase 4 Driver speeds up 5-6 Driver slows down 7 Driver moves out of way violently, if driver is in outside lane he will move onto shoulder or sidewalk, if he is in inside lane he will move into oncoming traffic, if multiple lane, he will move into adjoining lane regardless of traffic. 8 Driver slams on breaks 9-10 Driver moves out of way easily
City or rural side streetAt every city or rural side street encountered roll 1D10. If you are currently on a main thoroughfare, re-roll a 3-5 once and keep result.
For a stop light roll 1D6 : 1-3 green, 4 yellow, 5-6 red (if yellow it will change to red in 1D6/3 rounds (3-6 seconds)).
1D10 Result 1-2 Side streets have stop signs 3 You have stop sign 4-5 4-way stop sign 6-10 Stop light
Random Road OccurrencesRoll once every ten increments of random traffic, only during actual chases, or alternatively, a GM may simply use these instances as a guide for adding flavor a chase.
For every increment of random traffic rolled, there is a 10% chance of police presence.
1D100 Result 1-3 Driver ahead slams on brakes 4-10 Opening in traffic, road clear ahead for 2 increments (comes in to play next increment) 11-20 Vehicles ahead of you are side by side and blocking you from passing 21-24 Opportunity for cinematic maneuver (ramp allowing for jump, vehicle with loose cargo, etc...) (comes into play next increment) 25-29 As you move to pass a vehicle it suddenly swerves into your lane (18 difficulty to avoid) 30-35 Traffic closes behind you, hindering pursuit for 2 increments 36-38 Animal, person runs out into road ahead of you (18 difficulty to avoid) 39-42 Vacant lot, open field on side of road 43-45 Something falls from a vehicle in front of you (20 difficulty to avoid) 46-50 Emergency vehicle, lights and siren on, pulls onto road ahead of you, moves 30 km/h faster than posted speed limit, stays on road for 2D10 rounds 51-55 Collision between one or more vehicles in front of you (23 difficulty to avoid) 56-60 Road ends in a T-Junction (if on rural road, road becomes dead end, if on interstate, ignore and re-roll) 61-65 Road damage (large potholes, etc...) 66-72 Road changes size (even larger, odd smaller), roll 1D6/2 to determine additional lane increase/decrease. Even numbers always result in the lanes distributed equally to both outbound and inbound lanes, if the roll is odd, the GM determines placement of the lane (if the road gets smaller and decreases to 1 lane, the road becomes 1-way). 73-78 Oil, ice (15 difficulty to keep control, or glass, nails, debris, etc... (10% chance of blowout) 79-84 Sharp curve ahead, increases difficulty modifier by one level. 85-87 Driver from side street runs light or stop sign (24 difficulty to avoid) 88-93 Traffic jam ahead, all traffic comes to a complete stop 94-96 Oncoming traffic suddenly swerves into your lane (difficulty 26 to avoid) 97-100 Vehicle broken down in middle of the road
Fairly flat field +1 difficulty modifier level Partially wooded, rocky, and/or hilly terrain +2 difficulty modifier level Densely wooded, very rocky, and/or steep hills +3 difficulty modifier level Flat, hard packed desert +0 difficulty modifier level Loose sand desert +2 difficulty modifier level High dunes, drifting sands desert +3 difficulty modifier level
Off-road capable vehicles treat off-road conditions as being 1 difficulty modifier level lower.
Treaded vehicles treat off-road conditions as being 2 difficulty levels lower.
Vehicle Quality RatingThe GM should assign all primary vehicles (Characters Vehicle, involved NPC vehicles, etc.) a quality rating.
Breakdown chance is rolled once per day vehicle is used. There is ALWAYS at least a 1% chance of vehicle breakdown.
For every 20% of SDP damage taken a vehicle drops one category and must make an immediate breakdown chance roll.
Quality Rating Chance of breakdown per day Last Legs 20% Used and Abused 15% Normal 10% Maintained 5% Showroom Quality 1%
Other quality rating modifiers New vehicle (1 year old or less) -10% Used (2-10 years old) +5% Well used (11-20 years old) +10% Classic (21-30 years old) +15% Antique (31+ years old) +20% Standard maintenance 0 Well Maintained -5% Lovingly maintained by top grade professional mechanics -10% No Maintenance +10%
A brief word on aerodynesAV's, advanced hovers and helicopters must adhere to the same penalties applied to ground level traffic when in an urban metropolis environment and involved in a chase. While aircraft have the luxury of traveling above the rooftops in normal situations, when involved in a chase, to be effective they must follow the streets that the vehicles they are pursuing are on. This is really only important in a metropolis type setting, where skyscrapers and other tall buildings are prevalent. In a smaller town, or even in a heavily urbanized area where the buildings are rarely more than 4 stories tall, Aircraft are not constrained by these rules. Alternatively, even in an urban metropolis, the Aircraft may gain elevation to escape the close confines, but this will take him out of attack range of the ground, and it will add two levels of difficulty to all rolls attempting to spot and follow the ground vehicles due to distance and altitude. If the chase is between aircraft alone, then rules apply as normal. All air traffic is to be treated as if having rolled 1D6 less than the result on the random traffic generator.
All AV's are equipped with a GPS linked Collision Avoidance (CAV) system. This system is one of the most advanced navigation systems in the world and monitors the activities (altitude, speed, and direction) of all aerodynes, helicopters, dirigibles, and other aircraft within a 10 km radius (the military version is good to 15 km). Police Aerodynes and some ground vehicles can scan for the system, and every landing pad in the city is set up to detect the CAV System as well. Driving an AV in an urban environment (defined by law as any population center with at least 5000 citizens in a 15 km radius) without the CAV system is a felony punishable by up to 20 years in prison. Also, since all AV's are required to have the system installed during manufacture, it requires an illegal modification (High Difficulty) to remove it. Though scratch building an AV without it is possible. Due to powerlines, bridges, overpasses, streetlights, walkways, and the like, it is extremely inadvisable for any aircraft to even attempt to operate lower than 15m from the ground in an urban environment. Doing so immediately raises the Difficulty Modifier level for the AV to Very Difficult, in addition to whatever modifiers it may be facing.