sla_industries_brp/sla-industries-brp/SLA_VEHICLES_AND_CHASES.md

Vehicles & Chases (BRP - SLA Industries)

Document Status: First Draft - Playable
Scope: Fast, table-ready vehicle and chase rules integrated into the SLA BRP Edge framework.

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1. Design Goals

These rules are built to:

• plug into existing BRP roll-under checks,
• use the same Advantage/Normal/Disadvantage edge flow,
• avoid hex-by-hex bookkeeping,
• keep chase scenes tense and cinematic.

If a scene slows down, simplify to one opposed chase test per round.

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2. Vehicle Stat Block

Each vehicle uses this profile:

• Type - Car, Van, Grav-Bike, APC, Train, etc.
• SCL Access - Typical minimum SCL for legal operation or issue.
• Cost - Credits (c).
• Crew - Driver + passengers.
• Speed Bands - Crawl / Street / Highway / Pursuit.
• Handling - Percentile base for control tests.
• Armour - Damage reduction against incoming damage.
• Hull - Structural HP before vehicle failure.
• Size - Small / Medium / Large.
• Traits - Offroad, Enclosed, Open, Airborne, Sluggish, etc.

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3. Vehicle Templates

Downtown Compact Car

Type: Civilian Car
SCL Access: 10+
Cost: 800c
Crew: 1 + 3 passengers
Speed: Crawl / Street / Highway / -
Handling: 55%
Armour: 2
Hull: 20
Size: Medium
Traits: Enclosed, Common.

Notes:

• baseline Mort civilian profile,
• weak under sustained high-pressure pursuit.

SLA Interceptor (Grav Car)

Type: SLA Patrol Interceptor
SCL Access: 7+
Cost: 8000c
Crew: 1 + 1 to 2 passengers
Speed: Crawl / Street / Highway / Pursuit
Handling: 70%
Armour: 4
Hull: 30
Size: Medium
Traits: Enclosed, High-Performance, Airborne (low grav).

Notes:

• strong pursuit platform,
• favors aggressive closure and lane control.

Downtown Delivery Van

Type: Panel Van
SCL Access: 10+
Cost: 1200c
Crew: 1 + 1 passenger, cargo bay
Speed: Crawl / Street / Highway / -
Handling: 45%
Armour: 3 front / 2 side
Hull: 28
Size: Large
Traits: Enclosed, Sluggish, High Centre of Gravity.

Notes:

• excellent load utility,
• poor sudden maneuver profile.

Mort Sector Sled Grav-Bike

Type: Grav-Bike
SCL Access: 8+
Cost: 3500c
Crew: 1 rider (+1 at GM discretion)
Speed: Crawl / Street / Highway / Pursuit
Handling: 65%
Armour: 1
Hull: 16
Size: Small
Traits: Open, Agile, Exposed Rider.

Notes:

• strong threading and corner recovery,
• rider vulnerability remains high.

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4. Vehicle Tests

Driving uses an appropriate skill:

• Drive (Ground)
• Drive (Grav)
• Pilot (for relevant craft)

4.1 When To Roll

Do not roll routine travel. Roll only when:

• maneuver is risky,
• speed pressure is high,
• conditions are degraded,
• active opposition exists,
• failure would matter to scene outcome.

4.2 Edge Assignment

Advantage

• clean visibility,
• familiar route,
• prepped maneuver,
• superior vehicle for current terrain.

Normal

• standard Mort traffic/weather pressure.

Disadvantage

• heavy rain/smog/oil,
• panic crowds,
• damaged vehicle,
• overloaded cargo,
• severe route complexity.

4.3 Modifiers

Apply tactical modifiers as normal:

• minor factor: +/-10%
• strong factor: +/-20%
• severe factor: +/-30%

Example:

• Interceptor Handling 70%
• heavy rain + skyway debris: Disadvantage, -10%
• final target: 60%

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5. Speed Bands

Use qualitative speed:

• Crawl - parking/crowds/alley creep
• Street - normal city flow
• Highway - fast lanes, harder recovery
• Pursuit - near-limit operation

Band Changes

Increasing one band:

• usually free in calm scenes,
• under pressure may require a control test.

Failing that test:

• delay, poor line, or minor consequence.

Fumble:

• major control loss, obstacle impact, or crash check.

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6. Chase Structure (Abstract Bands)

Track relative distance only:

• Engaged
• Close
• Far
• Lost

No exact meter tracking required.

6.1 Chase Round

1. Set current band.
2. Each side declares approach:
   • Aggressive
   • Neutral
   • Evasive
3. Each driver makes chase test.
4. Compare outcomes.
5. Shift range band accordingly.

6.2 Comparison Priority

• Higher successful tier wins (Critical > Special > Success).
• If both fail, band usually does not change.
• If same tier tie, compare kept roll by table convention (for this subsystem, higher kept roll inside same tier wins tie).

6.3 Band Shift

• Aggressive winner: shift 1 toward Engaged.
• Evasive winner: shift 1 toward Lost.
• Neutral winner: usually hold band, or gain minor narrative edge.

Special/Critical may justify 2-step shift in extreme scenes.

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7. Obstacles and Environmental Pressure

Insert obstacle beats to make chases dynamic:

Examples:

• collapsed scaffold,
• checkpoint wall,
• flood lane,
• jack-knifed cargo truck,
• panicked civilian wave,
• maintenance drone swarm.

Obstacle Procedure

1. Describe hazard.
2. Call test (Drive, Mobility, COOL, etc.).
3. Apply edge from context.
4. Resolve:
   • Success: pass cleanly.
   • Failure: lose initiative/position or take minor damage.
   • Fumble: collision/spin-out sequence.

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8. Collisions and Crashes

8.1 Severity Ladder

• Low (Crawl): 1d6
• Medium (Street): 2d6-3d6
• High (Highway): 4d6-6d6
• Extreme (Pursuit): 8d6+

8.2 Damage Application

1. Roll collision damage.
2. Apply vehicle armour reduction.
3. Subtract from Hull.
4. Apply occupant damage (usually 1/2 or 1/3 of post-armour collision damage).

On a driving fumble during collision:

• double damage or roll twice, take higher.

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9. Vehicle Condition States

• New - no penalties.
• Used - normal.
• Worn - -10% Handling/chase tests.
• Damaged - -20% Handling; Pursuit unsafe.
• Wrecked - immobile, cover only.

When Hull drops below half:

• degrade one condition step.

At 0 Hull:

• Wrecked.

Repair uses existing repair gear/rules and costs.

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10. On-Foot Chases

Use same band model (Engaged/Close/Far/Lost) with alternate skills:

• Mobility / Athletics
• Stealth
• Survival
• occasional COOL under panic

Approach declarations stay identical:

• Aggressive / Neutral / Evasive.

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11. Example: RED BPN Skyway Pursuit

Setup:

• squad in SLA Interceptor,
• quarry in delivery van,
• heavy rain,
• starting at Close.

Round 1:

• Interceptor: Aggressive.
• Van: Evasive.
• Interceptor rolls success; van fails.
• Band shifts Close -> Engaged.

Round 2 (Obstacle):

• GM adds partial skyway collapse.
• Both roll at Disadvantage.
• Interceptor succeeds, van fumbles.
• Van takes collision damage and condition worsens.
• GM applies tactical reroute consequences and continues chase.

End conditions:

• quarry Lost,
• forced stop/surrender,
• vehicle disabled,
• or scene transitions to on-foot pursuit.

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12. Foundry Integration Pattern

12.1 For Vehicle Items

Store on vehicle records/items:

• type,
• crew,
• speed bands,
• handling,
• armour,
• hull,
• size,
• traits,
• current condition.

12.2 For Chase Tracking

Use a chase helper flow:

• select current band,
• select approaches,
• set edge + modifiers,
• roll both sides,
• output winner + next band.

Keep this visible in chat or a reference panel so all players can follow progress.

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13. Quick Reference Tables

13.1 Edge Defaults for Chases

Situation	Edge
Clean weather, known route, superior platform	Advantage
Normal city pressure	Normal
Storm/smog/debris/critical traffic	Disadvantage

13.2 Band Shift Intent

Winner Approach	Typical Shift
Aggressive	toward Engaged
Neutral	maintain / minor gain
Evasive	toward Lost

13.3 Crash Severity

Speed	Typical Collision Damage
Crawl	1d6
Street	2d6-3d6
Highway	4d6-6d6
Pursuit	8d6+

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14. Expansion Slots (Future)

Reserved for future passes:

• mounted weapon fire in chase bands,
• airframe altitude strata,
• convoy multi-vehicle initiative,
• pursuit heat / law-response escalation,
• route-map generators by district.